1Heat oven to 375°F. Place mini paper baking cup in each of 24 mini muffin cups.
2In large bowl, mix cookie mix, egg, butter and vanilla with spoon. Stir in peanut butter. Roll dough into 1-inch balls. Place in muffin cups.
3Bake 9 to 11 minutes or until just lightly browned. Immediately press peanut butter cup candy into center of each cookie. Cool 5 minutes before removing from pans to cooling rack; cool completely. Repeat with remaining dough.