1 lb. powdered sugar (1 lb. = 3 1/2 c. sifted)
1/2 c. cocoa
1/4 c. milk (4 tbsp.)
1/4 c. butter
1 tsp. vanilla
1/2 c. chopped nuts (optional)
Lightly grease an 8-inch square dish or line with wax paper. Set aside. Place powdered sugar and cocoa in a medium-sized, heat-resistant mixing bowl. Stir to mix. Add milk and butter to sugar and cocoa mix. DO NOT STIR.
Heat uncovered on HIGH for 2 minutes. After heating, stir just to combine ingredients. Add vanilla and nuts. Stir until blended. Pour into prepared dish; refrigerate for at least 1 hour. Cut and serve.