Potatoes au Gratin

Ingredients

• 6 cups baking potatoes peeled thinly sliced (6 to 8 potatoes)
• 0.3 cup butter 
• 0.5 tsp mustard dry
• 0.3 cup flour 
• 2.5 cups milk 
• 2 Tbsp onions chopped
• 0.3 tsp pepper 
• 8 oz cheddar cheese shredded divided kraft

Equipment

• sauce pan
• oven

Directions

1. Heat oven to 350F.
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.
3. Add 1-1/2 cups cheese and onions; cook 2 to 3 min. until cheese is melted, stirring frequently.
4. Layer potatoes and cheese sauce alternately in 2-qt. casserole sprayed with cooking spray, ending with cheese sauce.
5. Bake 1-1/4 hours or until potatoes are tender.
6. Sprinkle with remaining cheese; bake 5 min. or until melted.