Chewy Oatmeal Bars

1 1/2 c baking mix (Bisquick, etc.)
1 1/2 c quick cooking oats
1 c packed brown sugar
1/2 c margarine or butter, softened
1 egg
1/3 c semisweet chocolate chips, raisins, or chopped nuts

Preheat oven to 350°. Mix all ingredients except chocolate chips with fork until moistened (mix will be crumbly). Stir in chocolate chips. Press mixture evenly in ungreased rectangular pan (size 13x9x2 inches). Bake until center is set, approximately 15 to 17 minutes. Cut into bars while warm.