Jump to Recipe
There’s something about a banana cake that doesn’t need frosting or a stand mixer to feel worth making again next week.
This one-bowl banana snack cake is exactly that, much like my one-bowl olive oil cake. You mash your ripe bananas right in the mixing bowl, whisk in the wet ingredients, fold in the dry ones, and pour it all into the pan. One bowl, one pan, done.
I started making this on weekends when my bananas went spotty faster than we could eat them. Now I make it on purpose, using bananas that are almost too far gone, the mushier the better.
The cinnamon-sugar top turns a little crackly as it bakes, and the crumb underneath stays soft on the counter for days.
Why You’ll Love This Recipe
- Comes together in one bowl, no mixer required
- Uses up spotty, overripe bananas you’d otherwise toss
- Stays soft on the counter for days
- Cinnamon-sugar top adds crunch without frosting
Ingredient Notes
- Ripe bananas: Use bananas with fully black-spotted, soft skins. They’re sweeter and mash smoother than yellow ones.
- Sour cream: Adds moisture without thinning the batter. Plain full-fat Greek yogurt works as a straight swap.
- Butter: Melt it and let it cool slightly before whisking in the egg so the egg doesn’t scramble in the warm butter.
- Brown sugar: Keeps the crumb moist thanks to the molasses. Light or dark brown sugar both work.
- Cinnamon-sugar topping: Sprinkled on raw batter, it bakes into a thin, crackly crust. Don’t skip it, it’s most of the texture contrast.
Easy Soft One-Bowl Banana Snack Cake with Cinnamon
Ingredients
Method
- Heat the oven to 175 C / 350 F. Grease a 23 x 23 cm / 9-inch square baking pan or line it with parchment paper.
- Mash the bananas in a large mixing bowl until mostly smooth, with a few small lumps left.
- Whisk in the melted butter, granulated sugar, brown sugar, egg, vanilla extract, and sour cream until smooth and pale yellow.
- Sprinkle the baking soda, salt, and cinnamon over the wet mixture and whisk in until no streaks remain.
- Add the flour and fold with a spatula just until no dry flour is visible. Stop as soon as it looks even, overmixing here is what makes banana snack cake turn dense and gummy instead of tender.
- Pour the batter into the prepared pan and spread it evenly to the edges.
- Stir the topping sugar and cinnamon together in a small bowl and sprinkle evenly over the batter.
- Bake for 28 to 32 minutes, until a toothpick inserted in the center comes out clean or with a few moist crumbs and the edges are golden brown.
- Cool the cake in the pan for 15 minutes, then slice into 9 squares and serve.
Notes
- Use bananas that are fully spotted or black for the sweetest cake.
- Do not overmix once the flour goes in; stop at the first sign of no dry streaks.
- Line the pan with parchment for cleaner slices and easy lifting.
- Let the cake cool 15 minutes before cutting or the crumb tears.
Tips for Success
- Use bananas with black-spotted, soft skins for the sweetest, moistest cake.
- Fold the flour in by hand until just combined, the same no-mixer method used for this blackberry cornmeal cake; overmixing builds gluten and makes the cake gummy.
- Melt the butter and let it cool slightly before whisking in the egg so it doesn’t scramble.
- Line the pan with parchment paper if you want to lift the whole cake out for cleaner slices.
- Check doneness at 28 minutes since ovens vary, and the topping can scorch if you leave it too long.
Variations
- Stir 1/2 cup chopped walnuts or pecans into the batter for crunch and nuttiness.
- Swap half the flour for whole wheat flour for a denser, nuttier crumb.
- Skip the cinnamon-sugar topping and fold 1/2 cup chocolate chips into the batter instead.
Storage and Reheating
Store the banana snack cake in an airtight container at room temperature for 3 to 4 days, or in the fridge for up to a week if your kitchen runs warm.
Freeze cooled squares wrapped individually in plastic, topping-side up, for up to 3 months. Thaw at room temperature for about an hour before eating.
A 10-second zap in the microwave warms a slice through if you want it soft, but it holds up fine at room temperature straight from the container too.
Serving Suggestions
Banana snack cake works well with a mug of coffee or chai in the morning, since the cinnamon topping echoes the same warm spices in this molasses spice cake.
For dessert, warm a square for 10 seconds and add a scoop of vanilla ice cream or a drizzle of honey over Greek yogurt.
Pack squares for a lunchbox or a road trip snack. The sturdy crumb holds up well outside the fridge for a few hours.
FAQ
Why did my banana snack cake turn out dense and gummy?
Your banana snack cake turns dense and gummy when the flour gets overmixed. Once you add the flour, fold just until you stop seeing dry streaks, about 15 to 20 stirs. Overworking the batter develops gluten, which turns a soft snack cake into something closer to bread.
Can I use Greek yogurt instead of sour cream in this recipe?
Yes, Greek yogurt works as a straight swap for the sour cream. Use the same 60 g / 1/4 cup amount and the cake stays just as moist. Full-fat yogurt gives the closest texture, while low-fat versions make the crumb slightly lighter but still work.
How do I know when the banana cake is done baking?
The banana snack cake is done when a toothpick inserted in the center comes out clean or with a few moist crumbs, usually at 28 to 32 minutes at 175 C / 350 F. The edges should look golden brown and pull slightly from the pan sides. A wet, batter-coated toothpick means it needs a few more minutes.
Can I freeze this one-bowl banana snack cake?
Yes, this banana snack cake freezes well for up to 3 months. Wrap cooled squares individually in plastic and store them in a freezer bag, then thaw at room temperature for about an hour before eating. Freezing them topping-side up keeps the cinnamon-sugar crust from getting soggy.
What goes well with banana snack cake for breakfast?
Banana snack cake pairs well with plain yogurt and a drizzle of honey for breakfast, or a scoop of vanilla ice cream for dessert. Coffee or chai also works alongside it since the cinnamon topping echoes those spices. A smear of salted butter on a warm slice is my go-to.
Can I make this banana snack cake gluten free?
Yes, swap the all-purpose flour for a 1:1 gluten-free baking blend and the cake bakes up close to the original. The crumb turns slightly more crumbly, so let it cool fully before slicing. Check that your baking soda and cinnamon are labeled gluten-free too, since cross-contamination happens with some brands.
If you enjoyed this, try
- our Poached Pears with Cinnamon Syrup: Soft and Spiced
- our Molten Chocolate Snack Cake with Gooey Fudge Pockets
- this Soft Honey Walnut Sponge Cake with Whipped Cream Layers
- the Buttermilk Sugar Cake
