INGREDIENTS
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1 (14-oz.) pkg. Cracker Barrel Sharp Cheddar Macaroni & Cheese Dinner2 Tbsp. unsalted butter1 Tbsp. all-purpose flour1/2 cup whole milk1/2 cup sour cream1 large egg6 oz. Cracker Barrel Sharp Cheddar Cheese, shredded (about 1 1/2 cups), divided