In a large pot, cook the beef and onion over medium heat. Break apart the beef with a spoon and cook until browned. Drain any grease, if needed.
Stir in the ketchup, mustard, seasoned salt, garlic powder, Kosher salt, and pepper. Cook 1 minute. Stir in the dry noodles and broth.
Bring to a light simmer and cover with a lid. Cook 10 to 12 minutes, or until the noodles are tender. Stir halfway through cooking to prevent noodles from sticking.
Remove from heat and pour off any extra liquid, if needed. Stir in 3 Tablespoons heavy cream and the cheese. Stir until melted. Add more heavy cream, if desired. Season to taste. Add hot sauce, if desired, to kick up the heat. For a creamier sauce add in extra heavy cream. Serve while hot!
