In a large skillet over medium-high heat, cook the ground beef and diced onion until the beef is fully browned and the onions are translucent.
Drain the excess fat from the skillet.
Add the minced garlic and taco seasoning to the beef mixture and sauté for 60 seconds until fragrant.
Pour in the red enchilada sauce and beef broth, stirring to combine the liquids with the beef.
Incorporate the refrigerated cheese tortellini into the skillet, ensuring the pasta is partially submerged in the sauce.
Bring the mixture to a gentle simmer, then reduce heat to low and cover the skillet.
Simmer for 7 to 9 minutes, or until the tortellini are tender and have absorbed some of the sauce.
Remove the lid and sprinkle the shredded cheese evenly over the top of the dish.
Recover the skillet for 2 minutes until the cheese is completely melted and bubbly.
Garnish with chopped cilantro before serving.