Ingredients:
- 1 ½ cups sugar
- 1 cup sour cream
- ½ cup butter, softened
- 2 eggs
- 1 ¾ cups (3 or 4) ripe bananas, mashed
- 2 tsps vanilla extract
- 2 cups all purpose flour
- 1 tsp baking soda
- ¾ tsp salt
- ½ cup chopped walnuts (optional)
- ½ cup butter (for brown butter frosting)
- 4 cups powdered sugar (for brown butter frosting)
- 1 ½ tsps vanilla extract (for brown butter frosting)
- 3 tbsps milk (for brown butter frosting)
Directions:
- Heat oven to 375F. Grease and flour 15x10-inch jelly roll pan. For the bars, in a large bowl, beat together sugar, sour cream, butter, and eggs until creamy. Blend in bananas and vanilla extract. Add flour, baking soda, salt, and blend for 1 minute. Stir in walnuts.
- Spread batter evenly into pan. Bake 20 to 25 minutes or until golden brown.
- Meanwhile, for frosting, heat butter in a large saucepan over medium heat until boiling. Let the butter turn a delicate brown and remove from heat immediately.
- Add powdered sugar, vanilla extract and milk. Whisk together until smooth (it should be thicker than a glaze but thinner than frosting). Using a spatula, spread the brown butter frosting over the warm bars (the frosting will be easier to spread while the bars are still warm).