1. Preheat oven to 350.
2. Lightly spoon flour into a dry measuring cup and level with a knife.
3. Combine the flour, baking soda and salt in a small bowl, stirring well with a whisk
4. and set aside.
5. Combine brown sugar, vanilla and egg whites in a large bowl, beat with a
6. mixer at high speed for 1 minute.
7. Add flour mixture, beating just until combined.
8. Stir in chocolate chips and pecan. If you're eliminating pecans, add
9. another 1/4 cup of chocolate chips.
10. Spread batter into an 8 square pan coated with cooking spray.
11. Bake bars at 350 for 18-20 minutes or until golden and crusty on top.
12. Cool in pan for 10 minutes. Sprinkle with powdered sugar.