Heat oven to 375°F. Grease a 13 x 9 inch pan.

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 25 minutes or until golden brown.

Cool slighty (warm but not hot) and frost with frosting.

For frosting, Heat butter in a large saucepan over medium heat. Watch carefully when it reaches a medium brown color turn off heat, whisk in powdered sugar at a time, adding milk as it thickens, then add in vanilla. Pour over the warm banana bread brownies immediately, and smooth with a spatula, butter knife, or frosting spatula. Cool completely before cutting.