Marbled Butterscotch Bars

Directions

1. 1
   Cream butter and brown sugar in large mixing bowl.
2. 2
   Beat in egg and vanilla.
3. 3
   Stir together flour, baking powder, soda and salt.
4. 4
   Blend into creamed mixture.
5. 5
   Spread batter in 2-quart utility dish.
6. 6
   Swirl melted chocolate over top with knife.
7. 7
   Microwave until top springs back when lightly pressed with finger (about 8-1/2 to 9 minutes).
8. 8
   Turn dish once or twice during cooking time.
9. 9
   Cool.
10. 10
    Cut into squares.