½ cup unsalted butter softened.

3 cups of powdered sugar.

1 ½ teaspoons of vanilla extract.

3 tablespoons of milk.

Directions:

Step 1

To begin, preheat your oven to 375°F (190°C), and then, generously grease a 9×13-inch baking pan with non-stick cooking spray to ensure the brownies don’t stick to the pan during baking.

Step 2

After that, in a mixing bowl, combine the sugar, sour cream, softened butter, and eggs. Use an electric mixer to blend the ingredients together until well combined and smooth.

Step 3

In this step, in a mixing bowl, beat sugar, sour cream, softened butter, and eggs. Incorporate the mashed bananas and vanilla extract into the mixture, stirring until thoroughly combined.

Step 4

Mix in the dry ingredients (flour, baking soda, salt) until combined, then add chopped walnuts.

Step 5

Next, pour the banana batter into the greased baking pan. Bake in the preheated oven for 20-30 minutes or until fully cooked and ready.

Step 6

Then, use a toothpick to check doneness. Clean toothpick means they’re ready.

Step 7