Prep the Oven & Pan (10 minutes)
Preheat oven to 350°F (175°C).
Grease and flour a 9x13-inch baking dish or two 9-inch round cake pans.
Mix Dry Ingredients (5 minutes)
In a medium bowl, whisk together flour, baking soda, and salt. Set aside.
Cream Butter & Sugar (5 minutes)
In a large mixing bowl, beat butter and sugar together until light and fluffy (about 2–3 minutes).
Add Eggs, Sour Cream, and Bananas (5 minutes)
Beat in the eggs one at a time.
Mix in sour cream, vanilla extract, and mashed bananas until well combined.
Combine Wet & Dry Ingredients (5 minutes)
Gradually add dry ingredients to wet ingredients, mixing just until combined. Do not overmix.
Bake (30–35 minutes)
Pour batter into the prepared pan(s).
Bake until a toothpick inserted in the center comes out clean.
Cool & Frost (20 minutes cooling)
Allow cake to cool completely before frosting.
Beat cream cheese, butter, powdered sugar, and vanilla until smooth and creamy.
Spread frosting evenly over the cooled cake.