This Banana Cake with Chocolate Frosting is tender, moist, and warmly spiced with cinnamon. It begins with browned butter for a nutty, caramel-like depth, and the batter bakes in a single 9-inch square pan—no layers, no fuss. The topping is a simple two-ingredient chocolate frosting made from thick Greek yogurt and melted dark chocolate, which keeps the frosting lighter, adds protein, and avoids refined powdered sugar.
Browned butter and coconut sugar lend rich caramel notes to the cake, so the crumb is flavorful even before the frosting is added. The recipe is naturally gluten free when made with gluten free flour.
What Makes This Banana Cake Different?
Browned butter creates a toffee-like, nutty character through the Maillard reaction that plain melted butter can’t match. Coconut sugar brings a subtle caramel undertone. The frosting replaces butter and powdered sugar with thick Greek yogurt and melted dark chocolate for a creamy, less-sweet finish. The overall result is a deeply flavored, gluten free cake with balanced sweetness and bold chocolate contrast.
Ingredients
Cake
- 2 sticks unsalted butter, browned and cooled
- 1 1/2 cups coconut sugar or light brown sugar
- 1 cup milk of choice
- 2 large eggs
- 1 1/2 cups mashed ripe bananas (about 3 medium bananas)
- 1 tsp vanilla extract
- 2 cups gluten free flour (see notes)
- 1 tsp baking soda
- 1 tsp ground cinnamon
Chocolate Frosting
- 1 cup thick Greek yogurt
- 1/2 cup dark chocolate chips, melted
What Each Ingredient Does
Brown butter
Browning butter caramelizes the milk solids, producing nutty, toasty flavors that add complexity to the cake. Let the butter cool for at least 10 minutes before combining with sugar and eggs so it doesn’t cook them or make the batter greasy.
Coconut sugar
Coconut sugar contributes natural sweetness with a mild caramel and molasses note that complements browned butter and banana. Light brown sugar can be used 1:1 if preferred.
Ripe bananas
Choose bananas with brown spots for maximum sweetness and flavor. As bananas ripen their starch converts to sugars, producing a softer, more intensely flavored mash—about three medium bananas yields the right moisture without a dense texture.
Cinnamon
Cinnamon enhances perceived sweetness and adds warmth that ties the brown butter and banana flavors together for a well-rounded profile.
Greek yogurt chocolate frosting
This simple two-ingredient frosting uses thick Greek yogurt as a creamy, protein-rich base and melted dark chocolate for richness without powdered sugar. Use a strained, full-fat style such as Fage Total or a thick Oikos variety for the best texture. After combining, chill the frosting 15–20 minutes if it seems loose; refrigeration firms it for easy spreading.
How to make Banana Cake with Chocolate Frosting, step by step
Preheat the oven to 350°F (177°C) and line a 9-inch square pan with parchment.
In a large bowl, combine the cooled browned butter, coconut sugar, milk, eggs, mashed bananas, and vanilla. Stir until evenly mixed.
Add the gluten free flour, baking soda, and cinnamon, and stir just until combined.
Pour the batter into the prepared pan and bake 35–38 minutes, or until a toothpick inserted in the center comes out clean.
Remove the cake from the oven and cool completely, at least 4 hours, before frosting.
To make the frosting, stir the Greek yogurt and melted dark chocolate together until smooth and thick. Chill 15–20 minutes if needed to thicken.
Spread the frosting over the fully cooled cake, slice into bars, and serve.
Why Brown Butter Transforms This Cake
As butter browns, water evaporates and milk solids toast, creating Maillard reaction flavors—nutty, caramel-like notes that layer with the natural caramel of coconut sugar and ripe bananas. Those extra few minutes of browning yield a more interesting, complex cake that stands out from versions made with plain melted butter.
Tips for the Best Results
Use the ripest bananas possible
Brown-spotted bananas deliver the best sweetness and flavor. If yours are still yellow, let them ripen at room temperature for a couple of days.
Cool the butter before mixing
Allow browned butter to cool for at least 10 minutes so it is warm but not hot—this prevents a greasy batter and avoids cooking the eggs.
Use thick Greek yogurt for the frosting
Thin yogurt yields a runny frosting. Choose a strained, full-fat brand and chill the frosting if it needs to firm up before spreading.
Do not overbake
Bake until a toothpick comes out clean. Overbaking dries the cake and prevents the tender, moist crumb this recipe aims for.
Substitutions
| Original | Substitute | Notes |
|---|---|---|
| Gluten free flour | All-purpose flour (1:1) | Direct swap if not gluten free |
| Coconut sugar | Light brown sugar (1:1) | Similar caramel note |
| Browned butter | Plain melted butter | Less complex flavor |
| Milk of choice | Any dairy or non-dairy milk | Negligible flavor difference |
| Greek yogurt (frosting) | Thick dairy-free coconut yogurt | Makes the frosting dairy free |
| Dark chocolate chips | Semi-sweet chocolate chips | Slightly sweeter, lighter color |
Storage
Refrigerator: Store the frosted cake in an airtight container for up to 4 days. The Greek yogurt frosting requires refrigeration.
Freezer: Freeze the unfrosted cake base for up to 2 months. Thaw overnight in the refrigerator and prepare the frosting fresh before serving.
Frequently Asked Questions
No. Plain melted butter will still produce a tasty cake, but browning the butter adds a distinct, nutty complexity that many will notice. It takes only a few extra minutes and is recommended when you have the time.
Thin or low-fat yogurt is usually the cause. Use a thick, strained Greek yogurt and refrigerate the frosting 15–20 minutes after mixing so it firms up for spreading.
Yes. Use a vegan butter that can be browned, such as a cultured plant-based butter, and substitute thick dairy-free coconut yogurt and dairy-free chocolate for the frosting.
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Get the Recipe:
Banana Cake with Chocolate Frosting
Ingredients
Cake
- 2 sticks unsalted butter, browned
- 1 1/2 cups coconut sugar or light brown sugar
- 1 cup milk of choice
- 2 eggs
- 1 1/2 cups mashed ripe bananas
- 1 tsp vanilla extract
- 2 cups gluten free flour
- 1 tsp baking soda
- 1 tsp cinnamon
Chocolate Frosting
- 1 cup thick Greek yogurt
- 1/2 cup melted dark chocolate chips
Instructions
- Preheat oven to 350°F and line a 9-inch square pan with parchment paper.
- In a large bowl, combine cooled browned butter, coconut sugar, milk, eggs, mashed bananas, and vanilla.
- Add gluten free flour, baking soda, and cinnamon; stir until just combined.
- Pour batter into the prepared pan and bake 35–38 minutes, until a toothpick comes out clean.
- Cool the cake completely, at least 4 hours, before frosting.
- Mix Greek yogurt and melted dark chocolate until thick and smooth; chill if needed to firm.
- Spread frosting over the cooled cake, slice, and serve.
Notes
- If you are not gluten free, all-purpose flour works 1:1.
- Plain melted butter can be used if short on time, though browned butter adds depth.
- Use ripe, brown-spotted bananas for best flavor.
- Avoid overbaking to keep the cake moist.
- Cool the cake fully before frosting so the yogurt topping doesn’t run.
- Choose a thicker Greek yogurt for the frosting; it will thicken further in the fridge.
- Store leftovers in the refrigerator for up to 4 days.