Preheat your oven to 350°F (175°C) and grease a round cake pan.

Cream together the softened butter and sugar until light and fluffy.

Beat in the eggs one at a time, ensuring each is fully incorporated.

Stir in the mashed bananas and vanilla extract.

In another bowl, whisk together the flour, baking soda, and salt.

Gradually add the dry ingredients to the banana mixture, alternating with sour cream.

Pour the batter into the prepared cake pan, smoothing the top.

Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.

Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

Prepare the frosting by beating together the cream cheese, butter, powdered sugar, and vanilla until smooth.