Cook the cheese tortellini according to package instructions. Drain and set aside.
In a large skillet, heat the olive oil over medium heat. Add the sliced onion and bell pepper, cooking until softened, about 5 minutes.
Add the sliced mushrooms to the skillet and cook for an additional 3-4 minutes until they are tender.
Push the vegetables to one side of the skillet and add the sliced beef. Season with garlic powder, salt, and pepper. Cook until the beef is browned and cooked through, about 5-7 minutes.
Pour in the beef broth and bring to a simmer. Let it cook for 2-3 minutes to reduce slightly.
Stir in the cooked tortellini and half of the provolone cheese. Mix well until everything is combined and heated through.
Remove from heat and sprinkle the remaining provolone cheese on top. Cover the skillet for a few minutes to allow the cheese to melt.
Garnish with fresh parsley before serving.