INGREDIENTS
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For Bars:
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1 cup softened butter
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1/2 cup granulated sugar
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1/2 cup light brown sugar
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2 egg yolks (slightly beaten with 1 tbsp water)
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1 tsp vanilla extract
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2 cups sifted flour
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1/4 tsp baking soda
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1 tsp baking powder
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1/4 tsp salt
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1 (12-oz) package semisweet chocolate chips
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For Topping:
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2 egg whites
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1 cup light brown sugar