When you want an unforgettable, bakery-worthy cake that elevates humble overripe fruit into pure luxury, Banana Cake with Salted Caramel Frosting is the ultimate answer. An ultra-moist, brown-sugar banana sponge laced with cinnamon is layered with a velvety homemade salted caramel buttercream, then finished with a glossy caramel drip and a sprinkle of flaky sea salt.
The secret to a banana cake that is fluffy and soft rather than dense or bread-like is Using Extra-Spotty Bananas, Buttermilk, and Chilling the Layers Before Frosting. Buttermilk reacts with baking soda to lighten the crumb, while overripe bananas provide natural sugar and moisture. Chilling the baked cake layers locks in the moisture and makes applying the smooth caramel frosting effortless.
Why You’ll Love This Cake
- Ultra-Moist Crumb: Overripe bananas and buttermilk guarantee a melt-in-your-mouth texture that stays fresh for days.
- Homemade Salted Caramel: A rich, amber-caramel base infused into the buttercream for deep, buttery flavor.
- Perfect Salty-Sweet Harmony: Flaky Maldon sea salt cuts through the sweetness of the frosting.
- Bakery-Style Presentation: Beautiful layered structure that makes any celebration extra special.
Key Ingredients Overview
- Overripe Bananas: Deeply spotted or black skins provide maximum sweetness and moisture.
- Buttermilk: Adds tender acidity to soften gluten and activate the baking soda.
- Brown Sugar & Cinnamon: Enhances the natural warm caramel notes of cooked bananas.
- Homemade Caramel Base: Heavy cream, butter, and granulated sugar caramelized to deep amber.
- Flaky Sea Salt (Maldon): Sprinkled between layers and on top for contrast.
Step-by-Step Instructions
1.The Salted Caramel Reduction:15 min.
In a medium saucepan over medium heat, melt 1 cup granulated sugar without stirring, swirling the pan occasionally until it turns a deep amber color (about 6 to 8 minutes). Remove from heat immediately and carefully whisk in 6 tablespoons unsalted butter, then slowly pour in ½ cup heavy cream and ½ teaspoon fine salt (it will bubble vigorously!). Stir until smooth, then pour into a jar to cool completely to room temperature.
2.The Banana Cake Batter Mix:10 min.
Preheat your oven to $175^\circ\text{C}$ ($350^\circ\text{F}$) and grease two 8-inch round cake pans, lining the bottoms with parchment paper. In a bowl, whisk 2½ cups all-purpose flour, 1 teaspoon baking soda, 1 teaspoon baking powder, 1 teaspoon ground cinnamon, and ½ teaspoon salt. In a large bowl, whisk ½ cup melted butter, ½ cup canola oil, 1 cup light brown sugar, and ½ cup white sugar. Whisk in 3 large eggs, 1 teaspoon vanilla, 1½ cups mashed bananas (about 3–4 medium), and ½ cup buttermilk until smooth. Fold dry into wet until just combined.
3.The Gentle Golden Bake & Chill:30 min.
Divide batter evenly between the prepared pans. Bake at $175^\circ\text{C}$ ($350^\circ\text{F}$) for 28 to 32 minutes until a toothpick inserted in the center comes out clean. Cool in the pans for 15 minutes, then invert onto wire racks to cool completely. Wrap cooled layers in plastic wrap and chill in the fridge for 30 minutes for easier frosting.
4.The Salted Caramel Buttercream Whip:5 min.
In a stand mixer fitted with the paddle attachment, beat 1 cup (2 sticks) softened unsalted butter on medium-high speed for 3 minutes until pale and fluffy. Sift in 3 cups powdered sugar, then pour in ½ cup of the cooled homemade caramel sauce and 1 teaspoon vanilla. Beat on high for 2 minutes until light and silky.
5.The Layer Assembly & Caramel Drip:5 min.
Place the first chilled cake layer on a plate or board. Spread 1 cup of caramel buttercream over top and drizzle with 2 tablespoons of extra caramel sauce. Top with the second cake layer. Frost the top and sides of the cake with the remaining buttercream. Drizzle remaining caramel around the top edges for a drip effect and sprinkle with 1 teaspoon flaky sea salt!
Expert Tips for Success
- Cool the Caramel Completely: Never add warm caramel to your butter when making buttercream! Warm caramel will instantly melt the butter, resulting in a runny, soupy frosting. Make the caramel first so it has time to cool.
- Mash Bananas Smoothly: Use a fork or potato masher to break down the bananas into a liquid-like puree. Whole banana chunks can create dense wet pockets inside the baked cake crumb.
- Chill Layers Before Assembly: Warm cake layers are fragile and crumbly. Spending 30 minutes chilling the baked layers in the fridge makes spreading buttercream smooth and free of loose cake crumbs.
The Recipe Card
- Prep Time: 30 mins
- Bake Time: 30 mins
- Cooling & Chill Time: 1 hour
- Total Time: 2 hours
- Yield: 10 to 12 Slices (Two-Layer 8-Inch Cake)
Ingredients:
- The Salted Caramel Base: 1 cup Granulated White Sugar, 6 tbsp Unsalted Butter, ½ cup Heavy Cream, ½ tsp Fine Salt.
- The Banana Cake Layers: 2½ cups All-Purpose Flour, 1 tsp Baking Soda, 1 tsp Baking Powder, 1 tsp Ground Cinnamon, ½ tsp Salt, ½ cup Unsalted Butter (melted), ½ cup Canola Oil, 1 cup Light Brown Sugar (packed), ½ cup Granulated White Sugar, 3 Large Eggs, 1 tsp Vanilla Extract, 1½ cups Mashed Very Ripe Bananas, ½ cup Buttermilk.
- The Caramel Buttercream & Garnish: 1 cup (2 sticks) Unsalted Butter (softened), 3 cups Powdered Sugar, 1 tsp Vanilla Extract, ½ cup Cooled Caramel Base, 1 tsp Flaky Sea Salt (Maldon).
Instructions:
Melt 1 cup sugar until amber; stir in 6 tbsp butter, heavy cream, and fine salt to make caramel sauce; cool completely. Whisk flour, baking soda, baking powder, cinnamon, and salt. Whisk melted butter, oil, brown sugar, white sugar, eggs, vanilla, mashed bananas, and buttermilk. Fold wet and dry, divide into two 8-inch pans, and bake at $175^\circ\text{C}$ ($350^\circ\text{F}$) for 28–32 minutes. Cool and chill layers. Whip 1 cup softened butter, powdered sugar, vanilla, and ½ cup cooled caramel into frosting. Layer cake with buttercream and caramel drip, and finish with flaky sea salt.
