3/4 cup (1-1/2 sticks) margarine, softened
1/2 cup granulated sugar
1/2 cup brown sugar
1/2 cup creamy peanut butter
1 teaspoon vanilla
1-1/2 cups flour
1/2 teaspoon baking soda
2 cups (12 ounce package) semi-sweet chocolate chips
Preheat oven to 375 degrees. Beat together margarine, sugars and peanut butter until creamy. Beat in egg and vanilla. Gradually beat in flour and baking soda. Stir in chocolate chips.
Drop by rounded tablespoonfuls onto ungreased baking sheets. Bake for 7 to 10 minutes or until edges are set. Let stand for a few minutes; then remove to wire racks to cool completely.