INGREDIENTS
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2 cups whole wheat flour
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1/2 cup all-purpose flour
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1 cup (packed) light brown sugar
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1/2 teaspoon baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup (1 stick) cold salted butter, cut into small pieces
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1/2 cup cold whole milk
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20 large marshmallows, halved crossways
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1 cup (2 sticks) salted butter
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1/2 cup cold half-and-half
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4 cups (24 ounces) semisweet chocolate morsels