Banana Bread Brownies

Steps

1. Preheat oven to 375°F. Grease and line a 9x13-inch pan with parchment paper, leaving overhang on the sides.
2. Beat sugar, sour cream, softened butter, and eggs in a large bowl until creamy.
3. Mix in the mashed bananas and vanilla extract.
4. Sift in flour, baking soda, and salt. Mix gently with a spatula until combined.
5. Fold in the chopped walnuts.
6. Spread the batter evenly in the prepared pan. Bake 30-35 minutes, until golden brown.
7. Let cool in the pan for 10 minutes before frosting.
8. For the frosting, heat butter in a pan over medium heat until it boils and turns brown, stirring frequently. Remove from heat and transfer to a large bowl.
9. Add half of the powdered sugar, vanilla, and milk to the browned butter. Whisk until smooth, adding more powdered sugar as needed to reach desired consistency.
10. Spread the frosting over the warm banana bread brownies. Slice and serve.