Tuna-Noodle Casserole

Cook rotini according to package directions. Drain; set aside.

Melt butter in a medium saucepan over medium heat. Cook celery and onion until softened, about 5 minutes. Stir in flour, dry mustard and black pepper; stir until bubbly and lightly golden-brown, about 1 minute. Add half-and-half and chicken broth all at once; cook, whisking frequently, until thickened and bubbly.

Add tuna, Smooth n Cheesy and cooked rotini. Transfer to 1-1/2-quart casserole dish sprayed with nonstick cooking spray. Sprinkle with crushed potato chips.

Bake, uncovered, at 375 degrees for 20 minutes or until bubbly. Let stand 5 minutes before serving.