Preheat oven to 350 degrees Fahrenheit and set out a mini muffin pan.

In a large bowl, combine the butter, both sugars, peanut butter, egg and vanilla and beat until fluffy.

In a separate bowl, combine the flour, baking soda and salt and gradually add to the butter mixture.

Beat until well blended.

Form dough into 1 inch balls and drop into cups on muffin pan.

Bake for 8 to 10 minutes or until puffy and lightly brown.

Press unwrapped Reese miniature into the center of each cookie and allow to cool completely in muffin pan.