1/3 c. peanut butter
3 c. confectioners' sugar
1 1/2 tsp. vanilla
1/2 c. milk (approx.)

Blend peanut butter and sugar. Stir in vanilla and stir in only about 1/3 cup of milk. Then keep adding a little bit more of the milk until it is smooth enough to mix with a hand mixer. Beat until it is smooth and of spreading consistency.