INGREDIENTS
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1 cup (2 sticks) unsalted butter, at room temperature
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1 cup white sugar
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2/3 cups light brown sugar, packed
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2 eggs
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1 teaspoon vanilla
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3-¼ cups all-purpose flour
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4 (1-oz) packages hot chocolate mix (not sugar-free; a total of about 1 cup of hot chocolate mix)
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1-¼ teaspoons salt
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1-¼ teaspoons baking soda
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1 cup milk chocolate chips
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1 cup semi-sweet chocolate chips
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1 1/2 cups mini marshmallows