Cheesy Beef and Green Beans

(based on a recipe from grace2882.wordspot.com)

1 lb ground beef
1 medium onion, chopped (about 1 cup chopped)
1 8-oz can tomato sauce
2 14-oz cans green beans, drained (or about a pound of fresh green beans, cooked)
1/4 teaspoon garlic powder
1/2 teaspoon chili powder
1 cup shredded cheddar cheese

In a large skillet, cook the beef and onion over medium heat until the meat is no longer pink and onions are tender. Drain. Stir in tomato sauce, green beans, garlic powder and chili powder. Cook until heated thoroughly. Add 1 cup cheddar cheese and stir until cheese melts.