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