This was delicious!  You could use tater tots instead of shredded potatoes.

Beef & Tater Casserole

1 lb ground beef, 95/5
1 can RF cream of mushroom soup
1 can green beans, drained
2 TB diced onion
2 c. frozen shredded potatoes

Preheat oven to 350*. Brown beef and onions; drain any fat. Mix all other ingredients except potatoes in large bowl. Add beef and onions and mix until combined. Pour into 8×8 baking dish. Spread potatoes evenly over the top of casserole. Bake uncovered at 350 degrees until heated through and potatoes are browned.
Yield: 4 servings. Per serving= 460 Calories; 5g Fat (17.7% calories from fat); 17g Protein; 35g Carbohydrate; 6g Dietary Fiber; 34mg Cholesterol; 1004mg Sodium. Exchanges: 1 1/2 Grain(Starch); 2 Vegetable; 0 Fat.