Preheat oven to 350 degrees.
In a large mixing bowl, combine all ingredients for bars.
Pour into a sprayed 9x13 baking pan and bake at 350 degrees for 20 minutes.
When done, press down with a spatula to make flat; cool slightly (for about 3 minutes).
Whisk together icing ingredients until smooth and pour over bars. When bars are cool, slice into squares.