Peanut Butter & Jelly Cookies
["1/2 c. butter or margarine", "3/4 c. peanut butter", "1/2 c. sugar", "3/4 c. brown sugar, firmly packed", "1 large egg", "1 1/2 c. unbleached all-purpose flour", "1/2 tsp. baking soda", "1/2 tsp. baking powder", "1/4 tsp. salt", "1 tsp. vanilla extract", "jam or jelly"]
["Mix the butter, peanut butter, sugar, brown sugar, egg and vanilla together, blending well. Blend in the flour, baking soda, baking powder, and salt, beating until well mixed. Cover and chill for 1 hour. Heat the oven to 375 degrees. Shape the dough into 1-inch balls and place 3 inches apart on lightly greased cookie sheets. With your thumb press deeply into the center of each ball. Bake for 10 to 12 minutes or until set but not hard. Let cool. Spoon small amounts of jam or jelly into each thumbprint."]
["butter", "peanut butter", "sugar", "brown sugar", "egg", "flour", "baking soda", "baking powder", "salt", "vanilla extract"]