Chocolate Frosting - cooking recipe

Ingredients

2 c. sugar
3 Tbsp. cocoa
1/4 tsp. cream of tartar
1/4 tsp. salt
1/2 c. milk
1 stick butter
1/2 tsp. vanilla

Preparation

Add ingredients, except vanilla, in a glass bowl. Mix well. Cook on High in the microwave for 5 1/2 minutes, stirring occasionally. Cool and put on your favorite cake.