All you need is :

4 mashed ripe bananas.

1 tbsp pure vanilla extract.

2 large eggs.

1 cup granulated sugar.

1 cup sour cream.

4 tbsp softened butter.

2 cups all-purpose flour.

1 tsp baking soda.

1 tsp salt.

For the brown butter frosting :

2 tbsp butter.

4 cup powdered sugar.

2 tsp vanilla extract.

1/3 cup milk

INSTRUCTIONS :

Step 1:

I preheated oven to 350 degrees F and spray a jelly roll pan with cooking spray.

Step 2:

I beat sugar, sour cream, butter, and eggs using an electric mixer, add mashed bananas and pure vanilla extract.

Step 3:

Then I added flour, salt, and baking soda and blend for more than 2 minutes.

Step 4:

I spread batter evenly into pan and baked for 20 to 25 minutes or until golden brown.

Step 5:

Meanwhile, I made the brown butter frosting, I heated butter in a large saucepan over medium heat until boiling.

Step 6:

Then I added powdered sugar, milk, and vanilla, whisked together until smooth, and poured it over the warm bars.

IT WAS AMAZIIIIING

ENJOY.