Ingredients

• 0.67 cups packed brown sugar
• 4.5 tablespoons unsalted butter , cut into small pieces
• 3 medium bananas , sliced 1/4-inch thick
• 1.75 cups all-purpose flour
• 1.5 teaspoons baking powder
• 1 teaspoon baking soda
• 0.5 teaspoons ground cinnamon
• 1 pinch salt
• 0.75 cups white sugar
• 0.33 cups unsalted butter , softened
• 2 large eggs
• 1.5 teaspoons vanilla extract
• 2 medium overripe bananas , mashed
• 0.33 cups sour cream

Instructions

1. 1 Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Grease an 8-inch square cake pan.
2. 2 Spread brown sugar on the bottom of the prepared pan and scatter butter pieces on top.
3. 3 Place the pan in the preheated oven until butter has melted, 5 to 7 minutes. Remove from the oven; stir and spread mixture evenly on the bottom of the pan. Arrange sliced bananas to cover the bottom. Set aside.
4. 4 Stir flour, baking powder, baking soda, cinnamon, and salt together in a large bowl; set aside.
5. 5 Beat white sugar and butter together with an electric mixer in a large bowl. Mix in eggs and vanilla until well combined. Add mashed bananas and sour cream; mix to combine. Add flour mixture on low speed and beat until batter is just combined.
6. 6 Pour batter over banana slices in the pan and smooth the top.
7. 7 Bake in the preheated oven until a toothpick inserted into the center comes out completely clean, 30 to 35 minutes.
8. 8 Let cool in the pan for about 30 minutes before inverting and slicing.

Nutrition per serving