Quick One Dish Supper Casserole

1 lb lean hamburger
1 bag or less frozen Tater Tots
1 medium onion chopped
1 cup fresh or frozen vegetables of your choice
1 can cream of celery soup

Crumble hamburger in bottom of 2 quart casserole. Combine remaining ingredients in a bowl then spread over hamburger. Cover tightly and bake at 350 degree oven for 1 hour. You can get creative with this dish.