Hamburger Pie

1 1/2 pounds Ground Beef
3/4 cup Chopped Onion
1 can Tomato Soup
1/4 cup Water
12 oz. Frozen Mixed Vegetables 
1/4 teaspoon pepper
4 medium potatoes, cooked and mashed with milk
Grated Sharp Cheddar Cheese

In a large skillet, brown ground beef and onions; drain off grease. 
Stir in mixed vegetables, soup, water, and pepper. Cook, stirring constantly until thoroughly heated--about 8 minutes.
Place mixture in a large casserole dish which has been sprayed with non-stick Pam. 
Top with mounds of mashed potatoes and sprinkle with grated cheese. 
Bake uncovered at 350 degrees for 30 minutes.