Peanut Butter Cookies
["1 1/4 c. flour", "1/4 tsp. soda", "1/2 tsp. baking powder", "1/4 tsp. salt", "1/2 c. soft margarine", "1/2 c. peanut butter", "1/2 c. moist brown sugar, packed", "1 egg", "1 tsp. vanilla"]
["Have baking sheets ready; do not grease.", "Start oven 10 minutes before baking; set to 375\u00b0."]
["flour", "soda", "baking powder", "salt", "margarine", "peanut butter", "brown sugar", "egg", "vanilla"]