Step 1

Preheat oven to 375 degrees F (190 degrees C). Whisk together the flour, salt and baking soda in a medium bowl; set aside.

Step 2

Cream together the butter, sugar, peanut butter and brown sugar until fluffy. Beat in the egg, vanilla and milk. Add the flour mixture; mix well. Shape into 1 inch balls and place each into a greased mini muffin tin (or use paper liners).

Step 3

Bake at 375 degrees for about 8 minutes. Do not overbake! Remove from oven and immediately press a mini peanut butter cup into each ball. Cool and carefully remove from pan.