Brown 1 1/2 pounds hamburger and 1 medium onion. Add 1 can green beans and 1 can tomato soup. Spread into pie pan or 8" square pan. Cover with 6 medium potatoes, mashed; add 2 tablespoons butter, 1/3 cup milk and 2 eggs. Sprinkle with grated cheese. Bake at 350 degrees for 30 minutes.