Preparation

Step 1: Preheat the Oven

Preheat your oven to 350°F (175°C). Grease and flour a 9×13-inch baking dish or line it with parchment paper.

Step 2: Mix the Dry Ingredients

In a medium bowl, whisk together the flour, baking soda, baking powder, salt, and cinnamon. Set aside.

Step 3: Prepare the Wet Ingredients

In a large bowl, mix the mashed bananas, melted butter, brown sugar, and granulated sugar until smooth. Add the eggs, vanilla extract, and sour cream, stirring until well combined.

Step 4: Combine and Bake

Gradually fold the dry ingredients into the wet mixture, stirring until just combined. Pour the batter into the prepared baking dish and smooth the top. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Step 5: Prepare the Cream Cheese Frosting

While the cake is cooling, beat the cream cheese and butter together until light and fluffy. Gradually add the powdered sugar, mixing until smooth. Stir in the vanilla extract and add milk, one tablespoon at a time, until the desired consistency is reached.

Step 6: Frost and Serve

Once the cake has completely cooled, spread the cream cheese frosting evenly over the top. Slice and serve!