"Try out a classic tonight with Easy Potatoes au Gratin. The layers of cheesy, warm potato slices in our Easy Potatoes au Gratin recipe are sure to please...."
INGREDIENTS
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1/4 cup butter or margarine
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1/4 cup flour
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1/2 tsp. dry mustard
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1/4 tsp. pepper
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2-1/2 cups milk
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1 pkg. (8 oz.) KRAFT Shredded Cheddar Cheese, divided
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2 Tbsp. chopped onions
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6 cups thinly sliced peeled baking potatoes (6 to 8 potatoes)