INGREDIENTS
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1 1/2 cups granulated sugar
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1 1/2 cups brown sugar, packed
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1 cup salted butter, melted
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4 eggs
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1 egg yolk
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6 Tbsp evaporated milk or half and half
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2 tsp vanilla extract
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2 1/4 cups all-purpose flour
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1 cup unsweetened cocoa powder (Hershey's brand is best!)
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1/2 tsp baking powder
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Dash salt
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1/2 semi-sweet chocolate chips
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1/2 cup white chocolate chips (high quality, like Ghirardelli)
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1/2 cup chopped walnuts