Peanut Butter Frosting
1 jar (7-1/2oz) marshmallow cream
1/2 cup peanut butter
1/3 cup butter
1-1/3 cups confectioners sugar
2 Tbsp. milk
1/4 tsp. vanilla extract
In a small bowl, beat at low speed, marshmallow cream, peanut butter, and butter until smooth.
Increase speed to medium and beat in remaining ingredients until blended.
Evenly spread frosting on completely cold cake.