Instructions

1. Add the butter and the vanilla extract to a mixing bowl. The butter needs to be what we call "slightly softened" which is somewhere between straight out of the refrigerator and room temperature. 
2. Mix the butter and the vanilla together on medium speed until thoroughly combined (about 2 minutes.)  
3. Use a spatula to scrape the butter and vanilla mixture down from the sides of the bowl.  
4. Add 1 pound of Powdered Sugar (or 4 cups) to the butter/vanilla mixture in the mixing bowl.
5. Start your mixer (or electric beater) on the lowest setting and keep it on low until the butter and sugar are incorporated (about 30 seconds). Stop the mixer and scrape down the sides of the bowl and then increase the speed to medium-high and mix for another 30-45 seconds so the frosting gets light and fluffy.
6. If the frosting is dry, add 1 teaspoon of milk and mix again. Repeat this process until the frosting is the correct consistency.
7. Chop 1/2 cup of Reese’s Peanut Butter Cups (which for us was 10 mini peanut butter cups.) If you are going to use a decorating bag with the frosting, make sure the peanut butter cup pieces are small or they will stick in the decorating tip.
8. Gently fold the chopped Peanut Butter Cups into the frosting with a spoon.