Potatoes Au Gratin - Kraft Recipe | |

Ingredients

• 2 1/2 lbs 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 KRAFT Sharp Cheddar Cheese, shredded & divided
• 1/2 tsp Dijon mustard
• 1/4 cup KRAFT Grated Parmesan Cheese