In a small skillet, COOK hamburger, STIRRING, until no longer pink, about 10 minutes.
In a mixing bowl, STIR together cooked hamburger, soup, and green beans; TRANSFER mixture to a greased baking dish.
TOP mixture with mashed potatoes, SPREADING evenly.
BAKE at 350° until heated through, about 20 minutes.
Good use for leftover mashed poatoes
Per Serving (excluding unknown items): 545 Calories; 42g Fat (68.1% calories from fat); 24g Protein; 20g Carbohydrate; 4g Dietary Fiber; 98mg Cholesterol; 1646mg Sodium. Exchanges: 1/2 Grain(Starch); 2 1/2 Lean Meat; 2 Vegetable; 7 Fat.