Directions

1. Melt ¼ cup butter in large saucepan over medium heat. Add flour; cook, whisking constantly for 1 minute. Whisk in milk, water and dijon mustard. Bring to a boil, reduce to a simmer and cook until just slightly thickened, about 10 minutes. Stir in salt, pepper and cayenne. Remove from heat.
2. Combine pasta and 1½ cups cheddar cheese in 9" x 13" casserole dish. Pour sauce over pasta. Do not stir.
3. Set the Smart Oven+ Attachment base pan with heating element and Steamer Water Basin Pan on the oven rack. Fill Water Basin Pan with 4 cups of water and place Perforated Steamer Tray in place. Cover pasta with foil and place on Perforated Steamer Tray. Cover with Lid.