Frosted Chocolate Brownies

Melt together:
1/2 pound margarine
1/2 cup cocoa

Add:
1 3/4 cups sugar
1 cup flour
1 1/2 cups nuts (optional)
2 teaspoons baking powder
1 teaspoon vanilla
4 eggs

Bake at 350 degrees for 20 minutes in a 15X10 inch pan.  Frost with Chocolate Buttercream Frosting.

Chocolate Buttercream Frosting:
1/2 cup butter
2 cups confectioner's sugar
3 Tablespoons cocoa powder
1 teaspoon vanilla extract
2 Tablespoons milk

Mix together all ingredients.  May need to add more milk (slowly) until frosting reaches a spreadable consistency.  Spread on Chocolate Brownies.