This is a single-layer banana cake made in a 9-inch pan — softer and more tender than banana bread, with a crumb that stays moist for days. It takes about 20 minutes to put together and uses four very ripe bananas you’d otherwise throw out. If you’ve never baked a cake from scratch before, this is a good one to start with.
The technique that matters
Two things make or break this cake: how ripe your bananas are, and how gently you mix once the flour goes in. Bananas that are deeply speckled or almost entirely black will be sweeter, softer, and far easier to mash into a smooth paste — pale yellow bananas will give you a bland, starchy result. Once you add the dry ingredients to the wet, switch from a whisk to a spatula and fold just until no dry streaks remain. Overmixing at this stage develops gluten and turns a tender cake tough. Stop earlier than you think you need to.
About the ingredients
- Brown sugar: Packed means you press it firmly into the measuring cup. Loosely spooned brown sugar will leave you short, and the cake will be less rich.
- Sour cream or Greek yogurt: Either works. Full-fat versions give a better crumb than low-fat. Don’t substitute regular yogurt — it’s thinner and will loosen the batter too much.
- Unsalted butter at room temperature: It should dent easily when you press it but not feel greasy or look shiny. Cold butter won’t cream properly; melted butter will make the batter dense.
What can go wrong
- The center sinks after baking: Usually means the oven was opened too early or the batter was undermixed and had pockets of unincorporated wet ingredients. Don’t open the oven door before the 35-minute mark.
- The edges bake faster than the center: Dark metal pans run hotter. If you’re using one, reduce the oven temperature by 25°F and start checking at 40 minutes.
- The cake sticks to the pan: Parchment on the bottom is in the recipe for a reason — skip it and you risk losing the base of the cake. Grease the sides of the pan too, not just the bottom.
- The top browns too quickly: If the top looks done but a toothpick still comes out wet at 35 minutes, loosely tent the pan with foil and keep baking. The banana and brown sugar content makes this cake brown faster than a plain vanilla cake.
- The cake tastes flat: Check that your baking soda isn’t old. Drop a small amount in hot water — if it doesn’t fizz actively, buy a fresh box before you bake.
Storage and make-ahead
Unfrosted, the cake keeps well at room temperature under a cake dome or wrapped tightly in plastic for up to three days — it actually improves on day two as the moisture settles. If you’ve added cream cheese frosting, refrigerate it and bring individual slices to room temperature for about 20 minutes before eating; cold frosting mutes the flavor. To freeze, wrap the fully cooled unfrosted cake tightly in two layers of plastic wrap, then a layer of foil, and freeze for up to two months. Thaw overnight on the counter still wrapped. Skip freezing the frosted cake — the frosting weeps when it thaws and the texture suffers.
Moist Banana Cake
Equipment
- Mixing Bowl
- Whisk
- 9-inch cake pan
- Oven
- Cooling Rack
Ingredients
- 1 ¾ cups all-purpose flour preferably unbleached
- 1 teaspoon baking soda
- ½ teaspoon salt
- ½ cup unsalted butter room temperature
- ¾ cup sugar white granulated
- ½ cup brown sugar packed
- 2 large eggs room temperature
- â…“ cup sour cream or Greek yogurt
- 1 teaspoon vanilla extract pure
- 2 cups ripe bananas mashed, about 4 large bananas
Instructions
- Preheat your oven to 350°F (175°C). Grease a 9-inch cake pan and line it with parchment paper for easy release.
- In a mixing bowl, whisk together the flour, baking soda, and salt. Set aside.
- In another large bowl, cream the butter and sugars together until light and fluffy. This should take about 2-3 minutes.
- Add the eggs, one at a time, making sure to beat well after each addition. Incorporate the sour cream and vanilla extract, mixing until smooth.
- Fold in the mashed bananas, mixing until just incorporated. Avoid over-mixing to ensure a tender crumb.
- Gradually add the dry ingredients to the wet mixture, stirring gently until no streaks of flour remain.
- Pour the batter into the prepared cake pan, smoothing the top with a spatula. Bake for 45 minutes or until a toothpick inserted into the center comes out clean.
- Once baked, allow the cake to cool in the pan for 10 minutes, then transfer to a cooling rack to cool completely.
Notes
- For an even more moist cake, consider adding an additional mashed banana or a bit more sour cream.
- If the batter feels too thick, a splash of milk can help loosen it.
Nutrition
Common questions
Can I use a loaf pan instead of a 9-inch round cake pan?
Yes, a standard 9×5-inch loaf pan works. Expect a longer bake time — start checking at 55 minutes with a toothpick, and it may need up to 65 minutes.
My bananas aren’t very ripe yet. Can I still bake this today?
You can ripen them quickly by placing unpeeled bananas on a baking sheet in a 300°F oven for 15–20 minutes until the skins turn black and the fruit is soft. Let them cool completely before mashing.
Do I need an electric mixer, or can I do this by hand?
A hand mixer makes creaming the butter and sugars easier, but you can do it by hand with a wooden spoon — just plan on 4 to 5 minutes of vigorous stirring to get the mixture pale and fluffy. The rest of the steps are straightforward by hand.
How do I know the cake is actually done and not just browned on top?
A toothpick inserted into the very center is the most reliable test — it should come out clean or with a few dry crumbs, not wet batter. The edges will also start to pull slightly away from the sides of the pan when it’s ready.
What to bake next
- Soft and Sweet Banana Bread Cookies
- Caramelized Banana Tart
- Tropical Coconut Tres Leches Cake
- Moist Eastern European Carrot Cake