Drain your canned vegetables or, if using frozen, thaw first and drain the liquid. Place in casserole dish and mix in the diced onion, mayonnaise and shredded cheddar cheese. Make your topping of 1 sleeve of Ritz crackers or similar type with 1 stick of butter melted. Top your veggie mix with the cracker mix.

Bake at 350 for approx. 30 minutes or until brown.