Adapted slightly from Buttered Up and Baked cookbook by Matt Lewis and Renato Poliafto.
- Mix together cream cheese, butter and peanut butter with electric or hand mixer until well combined. Add icing sugar, vanilla, and sea salt, blend until well combined and frosting is smooth and creamy. Evenly frost on top of cupcakes. Decorate with peanuts if desired. Cupcakes and frosting can be made one day ahead, stored in airtight container at room temperature.