In a large skillet, heat 1 Tbs of olive oil over medium-high heat. Add the ground beef and cook until browned and cooked through, about 5 to 7 minutes.
Add the onions, bell pepper, mushrooms, and seasoning. Sauté until the vegetables are tender, about 7 to 9 minutes.
Add the beef broth, ketchup, and Worcestershire and simmer for over medium heat for 5 minutes.
Add the cheese and remove the skillet from the heat. Stir in the cheese until melted and smooth. Taste for salt level and add more if desired.