Meanwhile, In a large skillet, over medium-high heat, cook and crumble beef with the onion, until beef is no longer pink. Drain grease. Add the garlic and cook 1 minute. Add the brown gravy mix and water. Stir and cook until combined. Next, add the cooked noodles, cheese soup and shredded cheddar cheese. Stir until mixture is thoroughly heated through and combined; about 5 to 10 minutes. Turn off heat.