Heat oven to 190ºC . Remove wrappers from candies. Line small muffin cups (1- 2 cm in diameter) with paper bake cups. In large mixer bowl, beat butter, brown sugar, granulated sugar, peanut butter, egg and vanilla until light and fluffy. Stir together flour, baking soda and salt; add to butter mixture, beating until well blended. Shape dough into 3 cm balls; place one in each prepared muffin cup. Do not flatten. Bake 10 to dozen minutes until puffed and lightly browned; remove from oven. Immediately press peanut butter cup onto each cookie. Cool completely in muffin pan. About 3- half dozen cookies.
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