In a large pot or Dutch oven, heat the olive oil over medium heat. Add the sliced onion and bell pepper, cooking until they are softened (about 5 minutes).
Add the thinly sliced beef to the pot. Cook until the beef is browned, about 5-7 minutes, stirring occasionally.
Stir in the minced garlic and Italian seasoning, cooking for 1 minute until fragrant.
Add the cheese tortellini, beef broth, and heavy cream to the pot. Stir well to combine all ingredients.
Bring the mixture to a gentle boil, then reduce the heat to low and let simmer for about 5-7 minutes, or until the tortellini is cooked and the sauce has thickened slightly.
Remove from heat and stir in the shredded provolone cheese until melted and creamy. Season with salt and pepper to taste.
Serve hot, garnished with chopped fresh parsley.