Side Dishes
This America's Test Kitchen zucchini bread recipe delivers foolproof moisture using their signature science-backed techniques. After testing countless variations, I've adapted their method to ensure every slice stays tender for days—no dry crumbs here.
The secret lies in precise ingredient ratios and a specific mixing approach that distributes moisture evenly throughout the loaf.
What sets this recipe apart is the way we incorporate grated zucchini without over-moistening the batter. Per their proven method, we use 2 cups of zucchini (about 2 medium zucchinis) and squeeze out excess liquid before mixing.
This simple step prevents a gummy texture while keeping the bread richly moist and packed with natural sweetness. The baking process at 350°F for 50-60 minutes ensures even doneness without over-browning.
By following these exact techniques, you'll achieve a loaf with a perfectly domed top, moist crumb, and subtle cinnamon warmth in every bite. The bread stays fresh for up to 5 days when stored properly, making it ideal for meal prep or gifting.
Whether you enjoy it plain, with a simple glaze, or toasted with butter, this recipe delivers consistent, restaurant-quality results every time.
For those who prefer extra moisture, I recommend adding a lemon glaze after baking—just mix powdered sugar with lemon juice and brush it on while the bread is still warm.
This finishing touch enhances the natural sweetness while adding a bright citrus note that pairs beautifully with the spiced zucchini flavor. Let's get baking with confidence!
Ingredients for america's test kitchen zucchini bread
Fourteen ingredients transform into a tender, science-backed zucchini loaf with perfect moisture balance.
| Ingredient | Amount | Notes |
|---|---|---|
| All-Purpose Flour 🌾 | 2 ½ cups | Sifted for even distribution |
| Granulated Sugar 🍚 | 1 ½ cups | White or light brown preferred |
| Packed Brown Sugar 🍚 | ½ cup | Light or dark variety |
| Unsalted Butter 🧈 | 1 cup | Cold and cubed for precise measuring |
| Large Eggs 🥚 | 2 whole | Room temperature for even mixing |
| Vanilla Extract 🍯 | 2 tsp | Pure extract for authentic flavor |
| Medium Zucchini 🥒 | 2 whole | Grilled or raw, excess liquid squeezed |
| Ground Cinnamon 🌿 | 2 tsp | Freshly ground for optimal aroma |
| Ground Ginger 🌿 | 1 tsp | Freshly ground preferred |
| Ground Cloves 🌿 | ½ tsp | Freshly ground for depth |
| Baking Soda 🧂 | 1 tsp | Pure baking soda, not baking powder |
| Diamond Crystal Kosher Salt 🧂 | ½ tsp | Fine grain preferred |
| Lemon Juice 🍋 | 1 tbsp | Freshly squeezed for brightness |
| Powdered Sugar 🍚 | ½ cup | For lemon glaze finishing |
The zucchini selection is critical—opt for medium-sized varieties with firm skins, as they yield more usable flesh. Local farmers' markets often carry ideal specimens, or select the straightest zucchinis at Whole Foods for consistent grating. Grilling the zucchini first enhances natural sweetness while reducing excess moisture; simply char them skin-side down for 3-4 minutes per side before cooling and grating. For optimal texture, squeeze out all excess liquid using a clean kitchen towel—this step prevents a gummy crumb that plagues many home versions. The spices should be freshly ground; Penzeys Spices offers pre-ground blends that meet professional standards, or invest in a small coffee grinder for home use. The butter must be cold when measured—softened butter incorporates unevenly, leading to dense pockets in the final loaf.
Substitutions must preserve the moisture balance. For the zucchini, carrot or sweet potato puree works at equal volume, though flavor will differ slightly. The brown sugar can be omitted entirely if you prefer a lighter loaf, but the molasses depth enhances the zucchini's natural sweetness. If you lack vanilla extract, vanilla bean paste provides superior flavor intensity. For those avoiding gluten, King Arthur gluten-free flour blend replicates the texture when substituted at a 1:1 ratio, though the crumb will be slightly denser. The lemon juice can be replaced with white vinegar at half the amount, though fresh citrus yields brighter results. Always measure spices precisely—doubling cinnamon, for example, will overpower the delicate zucchini flavor.
This loaf maintains peak freshness when stored in an airtight container at room temperature for 2 days, or refrigerated for 5 days. For longer storage, wrap tightly in plastic wrap and freeze for up to 3 months. To revive, thaw overnight in the refrigerator and warm in a 300°F oven for 10 minutes. The lemon glaze should be applied immediately after baking while the bread is still warm—this ensures proper adhesion. For gifting, slice into 1-inch portions and package individually with a dusting of powdered sugar. Each slice stays moist for 3 days** when properly stored, making this an ideal make-ahead option for breakfast or snacking.
Why You'll Love This Recipe
- You’re using pantry basics here: flour, sugar, butter, eggs—no specialty ingredients. A single batch stretches to leftovers, and the recipe scales easily. I’ll be real: I’ve made this with store-brand butter, and no one noticed the difference.
- No Mixer Needed: I swear by this recipe because it’s one of those rare breads that doesn’t require a stand mixer—just a bowl and a sturdy spoon. The butter gets creamed with sugars until fluffy, and the eggs bind everything together without any fuss. Honestly, my arms thank me every time.
- Moisture Locked In: That combo of brown sugar and butter? It keeps this zucchini bread tender for days. The grated zucchini (don’t drain it—trust the recipe!) adds natural moisture, but the sugars prevent it from getting gummy. First slice out of the fridge? Still perfect.
- Breakfast or Snack: Serve it warm with a smear of cream cheese for a lazy weekend breakfast, or pack slices for lunch—it’s that versatile. My kids grab it after school, and my husband takes it to work. (Yes, even on a Tuesday night.)
Step-by-step instructions for america's test kitchen zucchini bread
Here's the method that delivers consistently moist, tender crumb and perfect texture every time.
Prepare the Zucchini for Maximum Moisture Retention
Begin by grilling the 2 whole medium zucchini over medium heat for 8-10 minutes, turning occasionally, until the skins blister and char slightly. This process intensifies their natural sweetness while reducing excess moisture that can make bread dense. Alternatively, you can microwave them whole for 3-4 minutes if grilling isn't an option.
Transfer the grilled zucchini to a cutting board and let them cool for 5 minutes. Using a fork, gently mash them until you achieve a chunky puree with some texture remaining. This preserves the bread's moisture without making it gummy. Place the mashed zucchini in a fine-mesh strainer lined with cheesecloth and squeeze out all excess liquid. You should have about 1 cup of zucchini puree after draining—this precise measurement is critical for maintaining the perfect moisture balance in your bread.
Cream Butter and Sugars for Optimal Texture
In a stand mixer fitted with the paddle attachment, combine the 1 cup unsalted butter and both sugars (1.5 cups granulated sugar and 0.5 cup packed brown sugar) on medium speed. Beat for 3-4 minutes until the mixture is light, fluffy, and nearly doubles in volume. This thorough creaming incorporates air into the batter, which creates a tender crumb and helps the bread rise properly.
Stop the mixer and scrape down the sides of the bowl with a rubber spatula to ensure even mixing. The butter should be completely incorporated, with no visible sugar granules remaining. This step is where we build the foundation for that signature moist texture—don't rush it. The mixture should be pale in color and leave clean streaks when you lift the paddle.
Combine Wet Ingredients for Even Distribution
Add the 2 whole large eggs to the butter-sugar mixture, one at a time, mixing on low speed for 30 seconds after each addition. This gradual incorporation prevents the eggs from curdling. Next, add the 2 teaspoons vanilla extract, 1 tablespoon lemon juice, and the drained zucchini puree. Mix on low speed for 1 minute until fully combined.
In a separate bowl, whisk together the 2.5 cups all-purpose flour, 2 teaspoons ground cinnamon, 1 teaspoon ground ginger, 0.5 teaspoon ground cloves, 1 teaspoon baking soda, and 0.5 teaspoon diamond crystal kosher salt. With the mixer on low speed, gradually add the dry ingredients to the wet mixture, mixing just until combined. Be careful not to overmix—stop as soon as the flour is evenly distributed. The batter should be thick but pourable, with a few flour streaks visible.
Bake with Precision for Perfect Moisture
Preheat your oven to 350°F and grease a 9x5-inch loaf pan with butter or line it with parchment paper. Pour the batter into the prepared pan and smooth the top with a spatula. Bake for 50-60 minutes, or until a toothpick inserted in the center comes out clean and the top springs back when pressed gently.
The bread is done when the internal temperature reaches 205-210°F. If the top browns too quickly, tent the pan with aluminum foil during the last 15-20 minutes of baking. This ensures even cooking and prevents the exterior from becoming too dark while maintaining that moist interior. Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.
Prepare the Lemon Glaze for Finishing Touch
While the bread cools, prepare the lemon glaze by whisking together the 0.5 cup powdered sugar and 1 tablespoon lemon juice in a small bowl. The glaze should be smooth and pourable, with a consistency similar to heavy cream. If it's too thick, add 1 teaspoon water to thin it out.
Once the bread has cooled completely, drizzle the lemon glaze evenly over the top. Use a pastry brush to spread it into an even layer, allowing any excess to drip down the sides. This glaze adds a bright citrus note that complements the warm spices and enhances the bread's moisture. Serve slices at room temperature for the best texture and flavor balance.
Pro Tips For Making America'S Test Kitchen Zucchini Bread
- MEASURE BUTTER COOL: The recipe calls for softened butter, but I learned this the hard way—if it’s too warm, the bread turns greasy and dense. Stick it in the fridge for 10 minutes after taking it out of the package, then press your thumb into it. If it springs back slowly, it’s ready.
- GRATE ZUCCHINI FINE: I used to chop zucchini and wondered why my bread was gummy. The ATK recipe relies on finely grated zucchini—almost like wet sand—to distribute moisture evenly. Use the smallest holes on your box grater, and squeeze out excess liquid with a clean towel. (Yes, it’s tedious, but it’s worth it.)
- DON’T OVERMIX THE BATTER: Once you fold in the wet ingredients, stop after 20 strokes. I’ve seen people beat this like cake batter, and it makes the bread tough. The ATK method keeps it tender—just mix until the flour is barely incorporated. A few lumps won’t hurt.
- BAKE AT 325°F UNTIL DONE: The recipe says 325°F for 50-60 minutes, but I’ve seen people pull it out at 55 minutes because it “looks done.” Wrong. Use a thermometer—it’s ready at 190°F. If you cut it early, the center stays damp, and the crust gets too dark. (Your bread will thank you.)
Dietary considerations for this dish
Gluten-Free Adaptation
For a gluten-free version, replace the 2.5 cups all-purpose flour with 2.5 cups King Arthur gluten-free 1:1 baking flour. This blend mimics the texture of traditional flour while maintaining the bread's moisture.
I've tested this substitution with success—just ensure your measuring spoons are level, as gluten-free flours can be less dense. 🌾
Add 1 teaspoon xanthan gum to the dry ingredients if your blend doesn't contain it, as this binder helps replicate the structure of gluten. The baking time may increase by 5-10 minutes, so check for doneness at 55 minutes using the toothpick test.
Store gluten-free zucchini bread in an airtight container with a slice of bread to prevent drying.
Dairy-Free Substitutions
Swap the 1 cup unsalted butter for 1 cup dairy-free butter alternative like Miyoko's Creamery vegan butter, which melts and behaves similarly. For richer flavor, use coconut oil (solid at room temperature) at the same measurement.
The texture remains tender, though coconut oil adds a subtle tropical note that pairs well with the zucchini's natural sweetness.
Replace the 2 whole large eggs with 2 flax eggs (mix 2 tablespoons ground flaxseed with 6 tablespoons water and let sit for 5 minutes to thicken).
This substitution maintains moisture without altering the baking process. For extra richness, add 2 tablespoons applesauce to the wet ingredients to compensate for the reduced fat content.
Sugar-Free Option
Reduce the 1.5 cups granulated sugar and 0.5 cup packed brown sugar to 0.5 cup monk fruit sweetener or erythritol for a sugar-free version. These alternatives won't caramelize like sugar, so the bread will have a slightly denser crumb but maintain moisture.
Boost the spices to 3 teaspoons cinnamon and 1.5 teaspoons ginger to enhance sweetness perception.
Add 0.25 cup unsweetened applesauce to the wet ingredients to compensate for reduced sugar and fat. The lemon glaze can be made with 0.5 cup powdered erythritol and 1 tablespoon lemon juice, though it will be less glossy.
This version works well for those managing blood sugar while still delivering the bread's signature moist texture.
Nut-Free Allergy Safety
This recipe is naturally nut-free, but always check ingredient labels for cross-contamination warnings. The King Arthur gluten-free flour and Penzeys spices are both processed in nut-free facilities, making them safe choices for allergy sufferers.
When preparing the lemon glaze, use a clean pastry brush to avoid any potential cross-contact with nut products.
For added safety, prepare the bread in a dedicated nut-free kitchen area if other allergens are present. The zucchini bread's natural sweetness and spice profile make it a crowd-pleaser even without nuts, so no substitutions are needed for flavor.
Always store nut-free baked goods separately from other treats to prevent accidental mixing.
Lower-Calorie Version
Reduce the 1 cup unsalted butter to 0.5 cup and replace the remaining 0.5 cup with nonfat Greek yogurt. This swap cuts calories while maintaining moisture through the yogurt's protein content. The bread will have a slightly tangier note that complements the zucchini beautifully.
Cut the granulated sugar to 1 cup and the brown sugar to 0.25 cup to further reduce calories. Add 1 teaspoon vanilla bean paste for enhanced flavor without extra sugar. The texture remains tender, though the crumb will be slightly denser due to the reduced fat content.
This version pairs perfectly with a dollop of light whipped cream for a lighter dessert option.
Nutrition facts
Frequently asked questions
Why does this recipe use grilled zucchini instead of raw?
Grilled zucchini intensifies its natural sweetness while reducing excess moisture that can make bread gummy. The charring process also enhances the flavor profile, giving your loaf a deeper, caramelized note. Plus, grilling helps maintain the bread's tender texture by controlling moisture levels more precisely than raw zucchini.
Can I substitute applesauce for the zucchini?
Yes, but with adjustments! Use 1 cup unsweetened applesauce instead of the zucchini puree, but reduce the flour by 0.25 cup to maintain proper texture. The bread will have a slightly different flavor profile—more apple-forward and less zucchini—but it will still be moist and delicious. For best results, add an extra 0.5 teaspoon cinnamon to complement the applesauce.
How do I know when the zucchini bread is fully baked?
Look for three key signs: a toothpick inserted in the center should come out clean, the internal temperature should reach 205-210°F, and the top should spring back when pressed gently. If the top browns too quickly, tent the pan with foil for the last 15 minutes of baking to prevent over-browning while ensuring even doneness.
Will this bread stay moist overnight?
This recipe's science-backed method ensures moisture retention for up to 5 days when stored properly in an airtight container. For longer freshness, wrap individual slices in plastic wrap—their texture and flavor will remain perfect for 3 days at room temperature. For maximum shelf life, freeze the whole loaf for up to 3 months.
Can I make this recipe without a mixer?
Yes, but with a few adjustments! Cream the butter and sugars by hand using a wooden spoon or fork for 5-7 minutes until light and fluffy. For the wet ingredients, whisk them vigorously in a large bowl, then gently fold in the dry ingredients using a rubber spatula. The batter will be slightly less aerated, but you'll still achieve a tender loaf. Just be extra careful not to overmix once the flour is incorporated.