Peanut Butter Cup Cookies

1 3/4 C flour
1/2 t salt
1 t baking soda
1/2 C butter, softened
1/2 C sugar
1/2 C peanut butter
1/2 C brown sugar
1 egg
1 t vanilla
2 T milk
40 peanut butter cups, unwrapped

Preheat oven to 375 degrees. Sift together flour, salt, and baking soda; set aside. Cream together the butter, sugar, peanut butter, and brown sugar until fluffy. Beat in the egg, vanilla, and milk. Add flour mixture; mix well. Shape into 40 balls and place each in an uncreased mini muffin pan. Bake for about 8 minutes. Remove from oven and immediately press a mini peanut butter cup into each ball. Cool and carefully remove from pan.