Lightly grease 9 x 13 pan. Add 2 or 3 layers potatoes. Next add green beans, then pork chops. Peel and slice onions in half, then into several wedges. In a bowl, stir onions, cheese and mayonnaise. Place on pork chops. Cover and bake 350-400F about 90 minutes. Remove cover to brown onions. The cooking time will vary, depending on how thick everything is and how much moisture is in each item. Check after about an hour or so. I have made this several times now and it is delicious. For those who aren't crazy about mayonnaise, there is no mayo taste.