Chicken Salad Casserole

3 cups cooked chicken, diced
1 cup sliced celery
1 ( 8 ounce) package shredded cheddar cheese
1/4 cup diced onion
1 teaspoon salt
1/4 teaspoon pepper
mayonnaise
6 slices tomato
1 cup crushed potato chips

Combine:
 chicken, celery, 1/2 of cheese, onions, seasonings, enough mayonnaise 
to moisten. Toss lightly, put in greased casserole. Top with tomato 
slices, crushed potato chips, remaining cheese. Bake at 350 for 30 
minutes.