Chocolate Peanut Butter Cups

Quick, easy and delicious!  I LOVE these little cups!  They're way better than the Reese's ones.  Enjoy!
-1 1/2 cups semi sweet chocolate chips
-1 cup peanut butter
-1/2 powdered sugar
-1/2 tsp vanilla extract
Melt chocolate chips.  In a large bowl, mix melted chocolate and rest of ingredients.  Mix very well.  Pour into small baking cups.  Refrigerate until set.  Makes about 30 cups.  Enjoy!