Cook the pasta according to package directions.
While the pasta cooks, heat a large skillet over medium-high heat.
Add sliced flank steak and season with salt and pepper.
Sauté the flank steak for about 3-4 minutes until browned, then remove it from the skillet.
In the same skillet, add sliced onions and bell pepper.
After the vegetables have softened, add minced garlic and cook for an additional minute.
Pour in the beef broth, scraping the bottom of the skillet to deglaze.
Stir in the heavy cream and let the mixture simmer.
Return the cooked flank steak to the skillet, followed by the shredded provolone cheese.
Once the cheese has melted, combine the pasta with the sauce and stir until coated.
Serve hot, garnished with fresh parsley if using.