Peanut Butter Cups

Directions

1. 1
   Combine sugar, peanut butter, and butter in an electric mixer fitted with the paddle attachment. Beat on medium-low speed until combined. Transfer mixture to a pastry bag fitted with a 1/2-inch plain tip, and set aside.
2. 2
   Melt chocolate in a double boiler over simmering water. Keep melted chocolate over hot water near work area. Use a small spoon or small paintbrush to coat insides of the paper candy cups with the melted chocolate, making sure to cover the bottom and sides well. Transfer cups to a rimmed baking sheet or muffin tins (which will keep the cups from sliding around). Transfer to freezer until set, about 10 minutes.
3. 3
   Remove cold chocolate cups from the freezer. Pipe peanut-butter filling into each cup until three-quarters full. Spoon melted chocolate into each cup to cover. Return to the freezer until set, 15 to 25 minutes. Peanut-butter cups may be served right away, or kept tightly sealed in the freezer for 2 to 3 days. To serve, remove from freezer, peel off paper, and eat cold.