Peanut Butter Cups

1 (16 oz.) jar of peanut butter,  1 (12 oz.) bag of chocolate melts,  1 (12 oz.) bag of white chocolate melts, small muffin paper liners,  small muffin pan.   Melt peanut butter in a lg bowl in microwave at 30 second intervals, stirring after every 30 seconds (about 1-2 times)  Pour in bags of melts and stir after every 30 seconds, until melted and mixed, about 3 times depending on microwave.  Use a spoon to fill each little paper, about 1 1/2 TBS.   Can decorate with colored sugar or sprinkles.  Wait about 15 min. before putting sprinkles on.  Wait until set and remove from pan, no need to refrigerate.