Chocolate Buttercream Frosting
["3/4 c. cocoa", "2 2/3 c. unsifted confectioners sugar", "6 Tbsp. butter or margarine", "5 to 6 Tbsp. milk", "1 tsp. vanilla"]
["Combine cocoa and sugar in a bowl.", "Cream butter with 1/2 cup cocoa mixture in small bowl.", "Add remaining mixture alternately with milk, beating to spreading consistency.", "Blend in vanilla."]
["cocoa", "confectioners sugar", "butter", "milk", "vanilla"]