Potatoes au Gratin

Prep Time: 30 mins Total Time: 1 hour 5 mins Servings: 8

WHAT YOU NEED

  • 2-1/2 lb. baking potatoes (about 6)  
  • 1/4 cup butter  
  • 1 small onion, chopped  
  • 1/4 cup flour  
  • 1 tsp. salt  
  • 2-1/2 cups milk  
  • 1-3/4 cups CRACKER BARREL Extra Sharp Cheddar Cheese, shredded & divided 
  • 1/2 tsp. Dijon mustard  
  • 1/4 cup KRAFT Grated Parmesan Cheese

LET’S MAKE IT

  • Cook potatoes in boiling water 20 min. or just until tender; drain. Cover with cold water; cool.
  • Meanwhile, melt butter in medium saucepan on medium heat. Add onions; cook and stir 2 min. Blend in flour and salt; cook 1 min. Gradually stir in milk; cook 5 min. or until thickened, stirring constantly. Add 1-1/4 cups cheddar; cook and stir 1 min. or until melted. Stir in mustard.
  • Heat oven to 375°F. Peel potatoes; cut into 1/4-inch-thick slices. Layer alternately with cheese sauce in 2-qt. casserole sprayed with cooking spray, ending with sauce.
  • Bake 25 to 30 min. or until heated through. Top with remaining cheeses; bake 5 min. or until melted.
  • Special Extra: Garnish with chopped fresh parsley.