"Meet your new favorite cheesy potatoes au gratin! The evaporated milk and sharp cheddar make it extra-deluxe creamy...."
INGREDIENTS
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1/4 cup butter
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1/4 cup flour
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1/2 tsp. dry mustard
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1-3/4 cups 2% milk
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1 can (5 oz.) evaporated milk
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1 pkg. (8 oz.) KRAFT Shredded Sharp Cheddar Cheese, divided
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2 lb. Yukon gold potato es (about 7), peeled, thinly sliced
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1 small onion, thinly sliced