Preheat oven to 350ºF.
Melt butter and combine with sugar. Add egg and mix well. Stir in peanut butter and vanilla until smooth. Add the remaining dry ingredients and mix well.
Drop by teaspoonful onto ungreased cookie sheet. Mark by dipping the tines of a fork into flour and making a cross on the cookie.
Bake 10-12 minutes or until golden brown.
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