Ham, carrot, corn and potato casserole

1 pound hamburger
1 medium onion, chopped
6 cups sliced potatoes
1 cup sliced carrots
10 ounces cream of mushroom soup
1 cup milk
1/2 cup corn
Salt and pepper to taste

Preheat oven to 350 degrees. In a skillet, brown hamburger with onion; drain off any grease. In a baking dish, combine potatoes, carrots, corn, hamburger and onion. Mix soup, salt, pepper and milk together. Add to casserole and stir together. Bake for two hours or until vegetables are done.