Peanut Butter Cup Cupcakes Ingredients Chocolate Cupcakes 1 cup white sugar 1 egg ½ cup milk ¼ cup vegetable oil 1 tsp vanilla extract ¾ cup flour ¼ cup cocoa ¾ tsp baking soda ¾ tsp baking powder ½ tsp salt ½ cup boiling water Mini peanut butter cups or Reese’s peanut butter cups