1.In a large skillet, cook the ground beef over medium heat until browned, breaking it up as it cooks.
2.Add the taco seasoning to the beef, stirring to coat. Then add the onion, tomatoes, tomato sauce, and chicken broth. Stir to combine.
3.Break the spaghetti in half and add it to the skillet. Stir to ensure the pasta is submerged in the sauce.
4.Bring the mixture to a boil, then reduce the heat and simmer for 15-20 minutes, stirring occasionally, until the pasta is 5.cooked through and the sauce thickens.
6.Remove from heat and stir in the cheddar cheese and sour cream until smooth and creamy.
7.Serve hot, garnished with chopped cilantro.