Ingredients:

For the banana bread brownies:

1 ½ cups of granulated sugar.

One cup of sour cream.

Half a cup of unsalted butter (equivalent to 1 stick) softened at room temperature.

2 large eggs, at room temperature.

3 ripe bananas, mashed.

2 teaspoons of vanilla extract.

2 cups all-purpose flour.

1 teaspoon of baking soda.

¾ teaspoon salt.

½ cup chopped walnuts.

For frosting:

½ cup unsalted butter softened.

3 cups of powdered sugar.

1 ½ teaspoons of vanilla extract.

3 tablespoons of milk.