Chicken Fajitas

8 Boneless skinless chicken breasts, cooked and sliced in strips
2 Bermuda onions, slice in thin rings and halved
3 Green bell peppers, sliced in thin strips
2 Teaspoons oil
1 Package fajita mix
2/3 Cup water
1 Tomato, coarsely chopped
16 (6 inch)Whole Grain Flour tortillas
Optional ingredients: lowfat grated cheddar cheese
light sour cream
Sauté onions and peppers in oil. Combine fajita mix with water and with cooked chicken to onion and pepper. Simmer 10 to 15 minutes. Add tomato and simmer 5 minutes more. Serve with warm tortillas. Top with optional ingredients. Serves 8.