1 lg. pkg. frozen vegetables
1 chopped onion
1 can water chestnuts
1/2 c. mayonnaise
1 tsp. mustard

Crumble Ritz crackers to cover deep dish pie pan. Mix above ingredients. Sprinkle 8 ounces of crumbled cheddar cheese on top. sprinkle top with Ritz crackers. Bake 1 hour at 350 degrees.