INGREDIENTS
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1/2 cup butter, room temperature
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1 cup white sugar
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3 eggs, divided (1 whole, 2 separated)
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1 1/2 cups flour
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1 tsp baking powder
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1/4 tsp salt
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1 tsp vanilla
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1/2 cup semi-sweet chocolate chips
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1 cup mini marshmallows
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1 cup brown sugar