48mini cupcake cup liners(optional - see recipe notes)
mini muffin tins
Preheat oven to 350 degrees.
Line mini muffin tins with mini cupcake liners.
Cream butter, peanut butter, sugar, egg, and vanilla together.
Sift flour, baking soda, and salt together. Blend into creamed mixture.
Roll dough into balls about nickel-size in diameter.
Place dough balls into cupcake liners.
Bake for 10 minutes (now is a good time to unwrap the Reese's miniature peanut butter cups).
Remove from oven and let cool for only 1 minute.
Press a Reese's miniature peanut butter cup into the center of each cookie.
Allow cookies to cool for about 5 minutes before removing from the muffin tin.
Cupcake liners are not necessary. Spray the mini muffin tin well with cooking spray before adding cookie dough balls. After cookies have cooled 5 minutes, run a knife around the edge of each cookie before removing them from the muffin tin.