Peanut Butter Frosting
["2/3 c. peanut butter (smooth)", "1/2 c. milk", "10 oz. powdered sugar", "1/2 tsp. vanilla"]
["Blend peanut butter, milk and vanilla.", "Gradually add sugar. Will frost two 9-inch layers."]
["peanut butter", "milk", "powdered sugar", "vanilla"]