1/2 c. butter
1/2 c. sugar
1/2 c. peanut butter
1/2 c. brown sugar
1 egg
1 tsp. vanilla
1 1/4 c. flour
3/4 tsp. baking soda
1/2 tsp. salt

Cream butter, sugar, peanut butter, and brown sugar. Beat in egg and vanilla and mix well. Mix together flour, baking soda, and salt and blend into above. Shape into 1-inch balls and place in ungreased small muffin tins. Bake 10 minutes at 375 degrees.

Remove from oven immediately and press a Reese's peanut cup into each muffin until just the top shows (2 bags of Reese's needed). Let cool about 5 minutes before removing. Take out with narrow blade knife.