Banana Cake Recipe With 1 Egg: Moist Crumb and Warm Spice Harmony

This banana cake recipe with 1 egg delivers a perfectly moist crumb and warm spice harmony that makes every slice irresistible. 💛 The single egg creates a tender yet sturdy texture while keeping the cake rich and flavorful—no one will guess it's made with half the usual eggs. I've perfected this version for home bakers who want restaurant-quality results without fuss.

The secret lies in ripe bananas and a simple spice blend that enhances the natural sweetness without overpowering it. This recipe requires just 15 minutes of prep and 35-40 minutes in the oven, making it ideal for weeknight baking. The cake stays moist for days, thanks to the egg's binding properties and the bananas' natural moisture content.

What you'll end up with is a cake that's perfectly balanced—sweet but not cloying, tender yet sturdy, with a subtle cinnamon warmth that lingers. The texture is moist and crumbly, not dense, and the aroma of baking spices fills the kitchen. It's the kind of dessert that feels indulgent yet wholesome, perfect for breakfast or an afternoon treat.

Whether you're accommodating dietary preferences or simply looking for a foolproof banana cake, this recipe delivers. The single egg ensures a lighter texture while maintaining structure, and the warm spices add depth without complexity. Ready to bake?

Ingredients for banana cake recipe 1 egg

Ripe bananas, warm spices, and one egg create the perfect moist crumb harmony.

The bananas are the foundation—ripe with brown speckles ensures natural sweetness without added sugar. Trader Joe's or local farmers markets often carry perfectly ripe bananas, or simply let them sit on the counter until they're soft. The walnuts add texture, so toast them first for enhanced flavor. For the spices, Penzeys or bulk bins offer freshly ground cinnamon and nutmeg, which make all the difference. The yogurt keeps the cake tender, so Greek yogurt with higher fat content works best.

No ripe bananas? Frozen bananas work perfectly—thaw and mash them first. Short on walnuts? Pecans or hazelnuts are excellent substitutes. The almond extract is optional but adds depth; if you skip it, a splash of vanilla bean paste intensifies the flavor. For the butter, European-style with higher fat content creates a richer crumb. The baking soda must be fresh—if it's more than six months old, it loses potency.

This cake stays moist for 4-5 days when stored in an airtight container at room temperature. For longer storage, wrap tightly and refrigerate for up to 1 week. Freeze portions for 3 months—thaw at room temperature before serving. The walnuts can be toasted and chopped ahead of time, saving prep day stress. Room temperature ingredients blend more smoothly, so take everything out 30 minutes before mixing.

Step-by-step instructions for banana cake with 1 egg

Here's how to achieve that signature moist crumb and warm spice harmony using just one egg.

Start by mashing the 2 cups ripe bananas in a large mixing bowl until completely smooth. I press them through a fine-mesh sieve to remove any fibrous bits—this ensures a silky texture in the final cake. To the mashed bananas, add the 0.5 cup melted unsalted butter, 0.5 cup plain yogurt, 1 tbsp vanilla extract, and 0.5 tsp almond extract (if using). Stir until fully combined and set aside.

The yogurt adds moisture and richness, while the almond extract deepens the flavor profile. Let this mixture sit for 5 minutes—this allows the flavors to meld and makes the next steps easier. The bananas should be completely smooth at this stage; if not, give them another quick mash with a fork.

In a separate medium bowl, whisk together the 1.5 cups all-purpose flour, 1 cup granulated sugar, 1.5 tsp ground cinnamon, 0.25 tsp ground nutmeg, 0.5 tsp baking soda, and 0.25 tsp salt. Sift the flour first to aerate it—this prevents dense pockets in the cake. Add the 0.5 cup chopped walnuts to the dry mixture and toss gently to distribute evenly.

Now, pour the wet banana mixture into the dry ingredients. Using a silicone spatula, gently fold everything together just until combined—do not overmix. You'll see some flour streaks, and that's perfectly normal. Overmixing develops gluten, which can make the cake tough. The batter should be thick but pourable, with a few visible walnut pieces throughout.

Preheat your oven to 350°F and grease an 8-inch round cake pan or line it with parchment paper. Pour the batter into the prepared pan and smooth the top with a spatula. Bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean with just a few moist crumbs clinging to it.

Here's the key to that moist crumb: don't overbake. The cake will continue setting as it cools, so pull it out when it's just slightly underdone. The edges should be golden brown, but the center should still look slightly jiggly. If you're unsure, check the toothpick test at the 30-minute mark—better to pull it out early than risk dryness.

Remove the cake from the oven and let it cool in the pan for 10 minutes. Then transfer it to a wire rack to cool completely. This gradual cooling prevents cracking and allows the moisture to distribute evenly throughout the cake. I like to dust the top with a light layer of powdered sugar just before serving—it adds a beautiful finish and balances the warm spices.

Slice the cake into 8 equal wedges and serve at room temperature. The texture should be tender and moist, with a delicate crumb that melts in your mouth. The walnuts add a satisfying crunch, while the cinnamon and nutmeg provide that comforting warmth. Store any leftovers in an airtight container for up to 3 days—though I doubt you'll have any left!

Troubleshooting perfect results

Dense or Gummy Texture

If your cake turns out dense or gummy, it’s usually from overmixing or underbaking. The single egg in this recipe needs gentle handling—fold just until combined, no more than 20 strokes with your spatula. Also, check your baking time: the cake is done when a toothpick comes out with moist crumbs, not wet batter. If it’s underdone, return it to the oven for 5-10 minutes at 325°F to finish cooking without drying out. 🔥

Dry or Crumbly Cake

A dry cake often means the bananas weren’t ripe enough or the oven ran too hot. For next time, use bananas with brown speckles—they’re sweeter and moister. If your oven runs hot, reduce the temperature to 325°F and bake for 45-50 minutes. To revive a slightly dry cake, brush warm slices with 2 tbsp melted butter or a simple honey glaze (mix 2 tbsp honey with 1 tbsp warm water and drizzle on top).

Cake Cracked on Top

Cracking happens when the cake cools too quickly. After baking, let it cool in the pan for the full 10 minutes before transferring to a wire rack. If you’re in a hurry, tent the pan loosely with foil while it cools to slow the process. For extra insurance, place the pan on a cooling rack instead of directly on the counter—this allows heat to escape evenly and prevents sudden temperature shifts.

Batter Too Thin or Runny

A runny batter usually means the bananas were overmashed or the flour wasn’t sifted properly. To fix this, chill the batter for 15-20 minutes before baking—this helps it set up better. If it’s still too thin, add 1-2 tbsp extra flour and fold gently. For future batches, make sure your bananas are fully ripe (they’ll mash more smoothly) and sift the flour thoroughly to incorporate air into the dry ingredients.

Uneven Baking or Pale Center

Uneven baking often stems from an oven that isn’t preheated long enough or a pan that wasn’t properly greased. Always preheat your oven for 15-20 minutes before baking, and use lightly greased parchment paper in the pan for even heat distribution. If the center stays pale, rotate the pan halfway through baking (after 20 minutes) and tent it loosely with foil to prevent over-browning on top while the middle finishes cooking.

Spices Too Overpowering

If the cinnamon or nutmeg flavors dominate, you can balance them by adding a pinch of vanilla bean paste or a splash of orange zest to the batter. For future batches, reduce the cinnamon to 1 tsp and nutmeg to ¼ tsp if you prefer a milder spice profile. The yogurt in this recipe naturally mellows strong flavors, so if you’re sensitive to spices, consider using plain yogurt with a lower fat content to further soften the taste.

Frequently asked questions