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

Take it off from oven, and let cool slightly.

Step 8

Prepare frosting. Melt butter until medium brown color in a saucepan.

Step 9

Subsequently, turn off the heat and gradually incorporate powdered sugar, one cup at a time, while stirring thoroughly after each addition to ensure proper combination.

Step 10

Add milk and vanilla extract, and blend until mixed.

Step 11

Finally, pour frosting over brownies, spread evenly, and let cool completely, then cut and serve.