Texas Brownie Frosting

1/2 cup butter
1/4 cup milk
1 tsp. vanilla
2 tsp. dark cocoa
3 1/2 cups powdered sugar

Mix butter, dark cocoa and milk.
Microwave on High for 2 minutes, turning once.
Stir in powdered sugar and vanilla.
Pour warm frosting on top of brownies.
Add 1/2 cup of nuts if desired.

Enough to frost one batch of brownies