Cook the rotini pasta according to package instructions; drain and set aside.
Season the flank steak with salt and pepper.
In a large skillet, heat olive oil over medium-high heat.
Add the flank steak and sear for about 4-5 minutes on each side until cooked to your liking.
Remove steak and let it rest before slicing thinly.
In the same skillet, add sliced onions, bell peppers, and garlic; sauté until softened.
Pour in beef broth and bring to a simmer.
Add the sliced steak back to the skillet.
Stir in the cooked pasta and mix well.
Top with shredded provolone cheese and cover until melted.