Classic Potatoes au Gratin

By á-51182

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)

Preparation

Step 1

HEAT oven to 350°F.

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.

LAYER potatoes and cheese sauce alternately in 2-qt. casserole sprayed with cooking spray, ending with cheese sauce.

BAKE 1-1/4 hours or until potatoes are tender. Sprinkle with remaining cheese; bake 5 min. or until melted.