Brown the beef: Heat the olive oil in a large skillet over medium heat. Add the ground beef and cook until browned, breaking it apart as it cooks. Drain the excess grease.
Satue the vegetables: Add the diced onions to the skillet and cook for 2-3 minutes until softened. Stir in the minced garlic and cook for another 30 seconds until fragrant.
Create the sauce: Pour in the beef broth, heavy cream, Worcestershire sauce, dijon mustard, dried thyme, salt, and black pepper. Stir everything together and bring to a gentle simmer.
Cook the tortellini: Add the cheese tortellini directly to the skillet, making sure they're submerged in the sauce. Cover and let it cook for about 5-7 minutes, stirring occasionally, until the tortellini are tender.
Make it creamy: Reduce the heat to low and stir in the sour cream, mixing until smooth and creamy. Let everything simmer for another minute until warmed through.
Garnish and serve: Remove from heat and serve with grated Parmesan. Enjoy!
