Preheat oven to 400 degrees. Grease a shallow 2-quart baking dish. In a 10-inch skillet over medium-high heat, cook onions and ground beef until meat loses its red color. Spoon off any excess fat. Season with salt and pepper. Spread meat mixture in baking dish; cover with undiluted soup and top with single layer of frozen tater tots. Bake for 45 minutes or until try stirring in a half cup fresh vegetables or drained leftover vegetables when you add the soup. Then top with tater tots and enjoy.