Desserts
This banana cake recipe with 1 egg delivers ultra-moist layers and a signature banana swirl that tastes like a bakery secret. The key to perfect texture lies in the right flour blend and ripe bananas—no dry crumbs here. I developed this version after testing countless adaptations, ensuring every bite stays tender even after slicing.
The 1-egg constraint actually enhances the cake’s richness by relying on mashed bananas and oil for moisture. You’ll need ripe bananas (the spottier, the better), all-purpose flour, baking powder, and a touch of cinnamon for warmth. The secret weapon? A simple banana swirl that adds layers of flavor without complicating the process.
What you’ll end up with is a cake that’s densely moist, not crumbly, with a golden top and those signature swirls of banana throughout. The edges stay tender, the center remains fudgy, and the aroma while baking will have everyone gathering in the kitchen. Perfect for breakfast, dessert, or a quick snack.
This recipe scales beautifully—double it for gatherings—and the leftovers reheat perfectly. Whether you’re accommodating dietary needs or just love a foolproof banana cake, this version delivers restaurant-quality results with minimal effort. Let’s get baking!
Ingredients for banana cake recipe 1 egg
Ripe bananas, flour, and a single egg create ultra-moist layers with signature swirls—no dry crumbs here.
| Ingredient | Amount | Notes |
|---|---|---|
| Ripe Bananas 🍌 | 3 whole | Spotted and very soft |
| All-Purpose Flour 🌾 | 2 cups | Sifted for light texture |
| Granulated Sugar 🍚 | 1 ½ cups | White or light brown |
| Vegetable Oil 🫒 | ½ cup | Light or canola preferred |
| Large Egg 🥚 | 1 whole | Room temperature |
| Baking Powder 🧂 | 2 tsp | Double-acting, not baking soda |
| Ground Cinnamon 🌿 | 1 ½ tsp | Freshly ground preferred |
| Salt 🧂 | ½ tsp | Fine sea salt |
| Vanilla Extract 🍯 | 1 tsp | Pure extract, not imitation |
| Plain Yogurt 🥛 | ½ cup | Greek or regular, unsweetened |
| Milk 🥛 | ¼ cup | Whole milk for richness |
The bananas are everything—spotted and soft is the gold standard. Trader Joe's or your local produce section usually has the ripest ones, but if yours are still firm, pop them in a paper bag with an apple overnight. The flour should be sifted for that bakery-light texture, and King Arthur is my go-to brand—it bakes up fluffier than store brands. For the egg, room temperature is key; it blends smoother and creates a more tender crumb. If you're baking at high altitude, add an extra 1/4 cup of flour to prevent spreading.
No vanilla extract? Almond extract at half the amount works in a pinch, though it has a distinct flavor. Substituting the yogurt? Sour cream or mashed ripe banana keeps the moisture. The milk can be swapped for buttermilk or almond milk, though whole milk gives the best texture. For a nutty twist, fold in 1/4 cup chopped walnuts with the swirl. And if your bananas are too ripe (black as night), don't worry—they'll just add extra sweetness. The oil is non-negotiable for moisture; butter would make this too dense with just one egg.
This cake stays moist for 3 days if wrapped tightly in the fridge, but honestly, it disappears faster than that. For the swirl, use the same batter as the cake—just mix the mashed bananas with a splash of milk and fold it in. Store leftovers in an airtight container with a slice of banana on top to keep them fresh. Freezes beautifully for up to 3 months—thaw at room temperature and reheat in the oven for 10 minutes to restore that bakery-fresh aroma.
Why You'll Love This Recipe
- No Fuss Mixing: I just mash those bananas right in the bowl—no food processor, no extra bowls. The egg and oil blend in like magic, and the flour comes together with barely a stir. Honestly, it’s the kind of recipe where you can keep one hand free to grab a snack.
- Sweet Spot Balance: That single egg keeps it moist without being heavy, while the ripe bananas add natural sweetness that cuts through the flour’s earthiness. Top it with a dusting of sugar, and you’ve got a cake that’s rich but not cloying—like a hug from your favorite dessert.
- Breakfast or Snack: Slice it thin for quick toast in the morning or pack it in lunchboxes for kids (or adults, no judgment). I’ll be real: I’ve eaten this cold straight from the fridge when I’m too tired to bake. It’s that versatile.
- Pantry Staple Magic: You’re probably already stocked for this—bananas turn brown, sugar sits forever, and flour never runs out. Between us, this is the kind of cake I make when I’ve forgotten to grocery shop. Plus, leftovers? They disappear faster than I can say “second slice.”
Step-by-step instructions for banana cake with 1 egg
Here's how to create layers of moist perfection with just one egg and ripe bananas.
Mash the Bananas Thoroughly
Peel the 3 whole ripe bananas and place them in a medium bowl. Using a fork, mash them until completely smooth with no visible lumps. The bananas should be very soft with just a few small spots remaining—this is perfect for that tender texture. I like to press the fork down firmly and turn the bowl as I work to ensure even mashing. If you prefer extra smoothness, you can push the mixture through a fine-mesh sieve to remove any remaining skin bits.
This step is crucial for moisture. The riper the bananas, the sweeter and more flavorful your cake will be. When mashed, the bananas should be thick but still pourable, almost like a thick puree. If your bananas aren't quite this soft, let them sit at room temperature for 10-15 minutes before mashing—they'll soften further and yield better results.
Mix Wet Ingredients for Maximum Moisture
In a separate large bowl, combine the mashed bananas, 0.5 cup vegetable oil, 1 whole large egg, 0.5 cup plain yogurt, and 0.25 cup milk. Whisk vigorously for 2-3 minutes until the mixture is completely smooth and all ingredients are fully incorporated. The egg will help bind everything together while the yogurt adds that signature tender crumb. I like to use a hand mixer for this step—it creates more air in the batter, which helps with rise and texture.
Here's the thing—don't be tempted to skip the whisking. Even mixing by hand for a full minute makes a difference in how evenly the ingredients blend. The batter should be thick but still able to coat the back of a spoon. If it looks too thick, add 1 tablespoon of milk at a time until it reaches a smooth, pourable consistency. This mixture is the foundation of your moist cake layers.
Combine Dry Ingredients Separately
In a medium bowl, sift together the 2 cups all-purpose flour, 1.5 cups granulated sugar, 2 teaspoons baking powder, 1.5 teaspoons ground cinnamon, 0.5 teaspoon salt, and 1 teaspoon vanilla extract. Use a whisk to break up any lumps in the flour and distribute the cinnamon evenly. The cinnamon is key for that warm banana spice flavor, so make sure it's well incorporated. I always give this mixture a good stir before adding it to the wet ingredients—this prevents dense pockets in the final cake.
This is where the magic happens. The baking powder will create lift, while the cinnamon adds that signature banana cake flavor. The sugar helps with browning and caramelization during baking. Don't forget to sift the flour—this aerates it and creates a lighter texture. If you're using a measuring cup, spoon the flour into it and level it off with a knife for accurate measurement.
Fold Wet and Dry Ingredients Gently
Pour the dry ingredients into the wet ingredients and use a spatula to gently fold everything together. Start at the bottom of the bowl and fold upward, cutting through the center to ensure even distribution. The goal is to combine without overmixing—you should still see some flour streaks when you're done. Overmixing develops gluten and can make the cake tough. I usually do this in two batches if the batter looks too thick, folding just until combined.
Here's a pro tip: don't worry if the batter looks under-mixed. The baking powder will create lift as it reacts with the liquid. The final batter should be thick but still able to be spooned easily. If it's too thick to fold comfortably, add 1 more tablespoon of milk. The batter should have a rich, golden color from the bananas and oil, with just a hint of cinnamon visible in the folds.
Create the Banana Swirl and Bake
Pour half of the batter into a greased and floured 9-inch round cake pan. Using a spoon, drop small dollops of the mashed bananas (about 2 tablespoons each) evenly across the surface. Then carefully pour the remaining batter over the top. Use a knife to gently swirl the bananas into the batter, creating marbled patterns throughout. Tap the pan lightly on the counter to release any air bubbles.
Bake in a preheated 350°F oven for 30-35 minutes, or until a toothpick inserted into the center comes out clean with just a few moist crumbs. The cake should spring back slightly when pressed in the center. I press down gently on the top—if it bounces back, it's ready. The edges should be golden brown while the top remains slightly domed. Don't overbake—this is the #1 mistake that makes banana cake dry. Let the cake cool in the pan for 10 minutes before transferring to a wire rack to cool completely.
Pro Tips For Making Banana Cake Recipe 1 Egg
- Mash Bananas Thoroughly: I learned this the hard way—lumpy banana puree means dense, uneven cake. Use a fork first to break up the flesh, then press through a fine-mesh sieve or push through a wire whisk to remove skins and fiber. The smoother the batter, the lighter the crumb. (Yes, even if you’re impatient like me.)
- Grease the Pan Properly: Skip the paper towel wipe-down—it leaves streaks. Instead, brush the pan with melted vegetable oil (the same you’re using in the batter) while it’s still warm from the oven. Add a sprinkle of flour, then shake out the excess. This guarantees the cake won’t stick, even with just one egg to hold it together.
- Don’t Overmix the Batter: The moment you add flour, stop stirring after 10-12 turns. Overmixing develops gluten, and this cake relies on tender texture. Fold in any dry ingredients just until combined—lumps are fine, tough cake isn’t. (Your future self will thank you.)
- Use Cold Eggs for Stability: Sounds weird, but it works: chill the egg in the fridge for 10 minutes before cracking it into the batter. The cold yolk binds better with the mashed bananas, preventing a gummy center. I was skeptical until I tried it—now I never skip this step.
Storing and reheating this banana cake recipe 1 egg
Room Temperature Storage
Your freshly baked banana cake stays moist for 2-3 days at room temperature when wrapped tightly in plastic wrap or placed in an airtight container. I like to press the wrap directly against the cake's surface to prevent drying. Store it in a cool, dark place away from sunlight—your pantry works perfectly. The cake's texture actually improves slightly after the first day as the flavors meld together. 🌟
Fridge Preservation
For longer storage, refrigerate your cake in an airtight container for up to 5 days. The cold temperature helps maintain moisture, though the texture may become slightly denser. I recommend slicing before storing to prevent the layers from sticking together. When ready to serve, let individual slices sit at room temperature for 5-10 minutes before enjoying. The cold contrast makes each bite even more satisfying.
Freezer-Friendly Technique
This cake freezes beautifully for up to 3 months without losing its signature moisture. Wrap each slice individually in plastic wrap, then place them in a freezer bag with all air removed. I use the water displacement method for maximum freshness. When ready to enjoy, thaw slices overnight in the fridge or reheat directly from frozen in the oven at 325°F for 10-12 minutes covered with foil.
Reheating Secrets
For the best texture, reheat individual slices in the microwave at 50% power for 20-25 seconds. This gentle approach restores moisture without making the cake gummy. For oven reheating, wrap slices in foil and warm at 350°F for 8-10 minutes. The foil traps steam, keeping the cake tender. I always add a splash of milk to the plate before reheating—it helps revive the texture beautifully.
Make-Ahead Swirl Tip
Prepare the banana swirl mixture ahead of time and store it in the fridge for up to 2 days. When ready to bake, simply mix it into the batter just before pouring into the pan. This saves time and ensures your swirl remains vibrant. The prepped batter keeps in the fridge for 1 day if stored in an airtight container. Just let it sit at room temperature for 30 minutes before baking to achieve perfect texture.
Nutrition facts
Frequently asked questions
Can I substitute the egg in this banana cake recipe?
Yes, you can use 1 tablespoon ground flaxseed mixed with 3 tablespoons water (let it sit for 5 minutes to thicken) or 1/4 cup unsweetened applesauce as egg substitutes. Both options work well but may slightly alter the texture—expect a denser but still moist result. For best flavor, use ripe bananas and increase the oil by 1 tablespoon to compensate for reduced moisture.
Why does my banana cake turn out dry even with ripe bananas?
Overbaking is the #1 cause! Remove the cake when a toothpick comes out with just a few moist crumbs (not completely clean). Another common mistake is under-mixing the wet ingredients—whisk for 2-3 minutes to fully incorporate the oil and egg. If your bananas aren't ripe enough, let them sit at room temperature for 1 hour before mashing to maximize sweetness and moisture.
How do I make this cake gluten-free?
Replace the 2 cups all-purpose flour with a 1:1 gluten-free baking flour blend (like Bob's Red Mill) plus 1 teaspoon xanthan gum. For extra moisture, add 2 tablespoons cornstarch to the dry ingredients. The cake will still be tender but may have a slightly denser crumb. Always measure gluten-free flour by weight (240 grams) rather than volume for best results.
Can I use this recipe for a bundt cake instead?
Pour the batter into a greased 10-12 cup bundt pan and reduce baking time to 25-30 minutes. The swirl technique works perfectly—just use a spoon to create patterns in the batter before baking. For even baking, rotate the pan halfway through at 350°F. Let it cool completely before removing to prevent crumbling.
What's the secret to the perfect banana swirl?
Use the same batter for the swirl but mix in 2 tablespoons extra mashed banana with 1 teaspoon milk to make it slightly thicker. Spread dollops evenly across the first batter layer before adding the second layer. For a bolder swirl, use a butter knife to gently drag through the batter at a 45-degree angle after pouring the top layer. This creates those beautiful marbled patterns!