In a small sauce pan melt butter over medium high heat, watch carefully when it reaches a medium brown color turn off heat, whisk in 1 C powdered sugar at a time, adding milk as it thickens, then add in vanilla. Pour onto hot from the oven brownies and spread evenly. Cool and serve.
In a small sauce pan, melt butter over medium high heat, watch carefully when it reaches a medium brown color turn off heat, let cool slightly.
Preheat oven to 375 degrees, spray with cooking spray a 13x9 cake pan.
Beat together first 3 ingredients, mix well. Add mashed bananas and vanilla, mix well.
Add 1 cup flour at a time, then add baking soda, and salt, mix just until incorporated.
Bake 18-20 minutes or until springs back with a light touch and golden brown.
5 minutes before the brownies are done make the frosting.