1 (1 lb.) box confectioners' sugar
1/2 c. cocoa
1/4 tsp. salt
1/4 c. milk
1 tbsp. vanilla extract
1/2 c. butter
1 c. chopped walnuts (optional)

Stir top 5 ingredients together until blended in 1 1/2 quart dish. Top with 1/2 cup butter. Microwave on high for 2 minutes. Stir smooth. Blend in 1 cup chopped walnuts. Pour onto wax paper lined 8-inch square dish. Chill.