Prep
15-30 mins
Cook
1 HR 15 MIN
Calories
250
Ingredients
1/4 cup
butter or margarine
1/4 cup
flour
1/2 tsp
dry mustard
1/4 tsp
pepper
2-1/2 cups
milk
1 pkg
(8 oz.) KRAFT Shredded Cheddar Cheese, divided
2 tbsp
chopped onions
6 cups
thinly sliced peeled baking potatoes (6 to 8 potatoes)
Instructions
Step 1
Heat oven to 350°F.
Step 2
Melt butter in medium saucepan on medium heat. Blend in flour, mustard and pepper; cook and stir 1 min. Gradually add milk, stirring until well blended; cook 3 to 5 min. until thickened, stirring constantly. Add 1-1/2 cups cheese and onions; cook 2 to 3 min. until cheese is melted, stirring frequently.
Step 3
Layer potatoes and cheese sauce alternately in 2-qt. casserole sprayed with cooking spray, ending with cheese sauce.
Step 4
Bake 1-1/4 hours or until potatoes are tender. Sprinkle with remaining cheese; bake 5 min. or until melted.