Melt butter in a large saucepan, reduce heat and add flour. Cook, while stirring for about 30 seconds, then add milk. Bring mixture to a slow boil, then reduce heat. Simmer until mixture thickens, stirring constantly. Add cheddar cheese and continue to stir on low heat until ready to use cheese sauce.
Grill marinated chicken and slice into strips. (I use McCormick Grill Mates Mesquite marinade). Cover and set aside.
Toss vegetables with olive oil and grill vegetable mixture, using vegetables of choice. (I use red and green peppers, broccoli and onions, but cauliflower and zucchini are also good).
Combine cheese sauce, grilled chicken and vegetables in a 3 quart casserole dish or a 13 x 9 x 2 inch baking dish. Put into a 350 degree preheated oven and bake for 20 to 30 minutes or until cheese sauce starts to bubble.
Serve and enjoy!
