Ingredients
For the Cake
- ½ cup unsalted butter softened
- 1-½ cups granulated sugar
- 2 large eggs at room temperature
- 1 cup full-fat sour cream
- 1 teaspoon vanilla extract
- 2 cups all-purpose flour
- 1 teaspoon baking soda
- ¼ teaspoon salt
- 1 cup mashed bananas ~2-3 large overripe bananas
Cream Cheese Frosting
- ½ cup unsalted butter softened
- 8 ounces full-fat cream cheese softened
- 1 teaspoon vanilla extract
- 2½ – 3 cups powdered sugar sifted
- 1-2 tablespoons milk or cream
Instruction
- Position an oven rack to the center of your oven and preheat the oven to 350 degrees F. Grease a 9×13 baking dish with cooking spray. Set aside.
- In a large bowl, cream the butter and sugar together until pale and fluffy, this can take 3-5 minutes. Once fluffy, add the eggs, sour cream, and vanilla and mix until combined.
- In a small bowl, mash the banana until completely broken down with a fork or potato masher. Measure out 1 cup of mashed banana and then add to the wet ingredients. Stir to combine.
- Over a large mixing bowl, sift flour, baking soda, and salt together. Whisk together to distribute the ingredients evenly.
- Add flour mixture to the wet batter and stir with a spatula just until mixed and no flour pockets remain. Be careful to not overmix or your cake will be tough.
- Pour the batter into the baking dish and spread out evenly. Bake for 25-35 minutes or until a toothpick inserted in the middle of the cake comes out dry. The top of the cake will be golden brown.
- Let the cake cool completely at room temperature before frosting.
Make the Frosting
- In a large bowl, beat butter and cream cheese together until creamy and smooth. Add in vanilla extract and 1 tablespoon milk and quickly beat again.
- Add 2 ½ cups of powdered sugar and beat until smooth. If needed, add up to 1 tablespoon of additional milk and ½ cup of powdered sugar, a little at a time until you reach the desired consistency. You are looking for a thick frosting that is easily spreadable.
- Spread the cream cheese frosting over the cooled cake. Refrigerate for 2-3 hours before serving for best results.
