Peanut Butter Cookies
["1/2 c. soft butter or margarine", "1/2 c. peanut butter", "1/2 c. white sugar", "1/2 c. brown sugar, packed firmly", "1 egg", "1 1/4 c. flour", "1/2 tsp. baking powder", "3/4 tsp. baking soda", "1/4 tsp. salt"]
["In a medium bowl, beat the butter, peanut butter, white and brown sugars and the eggs together until the mixture is light and fluffy."]
["butter", "peanut butter", "white sugar", "brown sugar", "egg", "flour", "baking powder", "baking soda", "salt"]