Mint Brownies

Brownie:
1 c butter plus 1 Tb
2 c sugar
2 tsp vanilla
4 eggs
1 1/2 c flour
1/2 c cocoa
1 c nuts, optional

Mint Frosting:
1/2 c margarine
4 Tb milk
2 tsp mint extract
1 lb powdered sugar
green food coloring

Icing:
melt 1/2 c margarine and 2 c chocolate chips

Bake brownies on jelly roll size pan at 350 degrees for 20 minutes. Cool brownies. Frost with mint frosting then chill for 20 minutes. Spread slightly cooled icing over frosting. Chill until icing hardens.