Step 1

Heat oven to 375°F. Remove wrappers from candies. Line small muffin cups (1-3/4 inches in diameter) with paper bake cups.

Step 2

Beat butter, brown sugar, granulated sugar, peanut butter, egg and vanilla until light and fluffy in large bowl. Stir together flour, baking soda and salt; add to butter mixture, beating until well blended. Shape dough into 1-inch balls; place one in each prepared muffin cup. Do NOT flatten.

Step 3

Bake 10 to 12 minutes until puffed and lightly browned; remove from oven. Immediately press peanut butter cup or piece onto each cookie. Cool completely in muffin pan.