Scotch (Butterscotch) Bars

Directions

1. 1
   Preheat oven to 350 degrees.
2. 2
   Lightly spoon flour into a dry measuring cup; level with a knife.
3. 3
   Combine flour, and next 5 ingredients (through baking powder), stirring with a whisk.
4. 4
   Set aside.
5. 5
   Combine oil, vanilla, and egg whites; add to flour mixture, stirring just until blended.
6. 6
   Lightly coat hands with cooking spray.
7. 7
   Press batter evenly into an 8-inch square baking pan coated with cooking spray.
8. 8
   Bake at 350 degrees for 18 minutes or until a wooden toothpick inserted in the center comes out clean.
9. 9
   Cool in pan on a wire rack.
10. 10
    Sift powdered sugar over top; cut into bars.