Peanut Butter Cookies
["1 1/4 c. flour", "3/4 tsp. baking powder", "1/4 tsp. baking soda", "1/4 tsp. salt", "1/2 c. butter or margarine", "1/2 c. sugar", "1/2 c. peanut butter", "1/2 c. brown sugar", "1 egg, well beaten", "1/2 tsp. vanilla"]
["Sift together first 4 ingredients. Cream the butter, sugar, peanut butter and brown sugar. Add egg and vanilla.", "Mix with flour mixture.", "Roll in small balls.", "Press with fork.", "Bake at 350\u00b0 for 8 to 10 minutes."]
["flour", "baking powder", "baking soda", "salt", "butter", "sugar", "peanut butter", "brown sugar", "egg", "vanilla"]