In a large pot, bring salted water to a boil and cook the penne pasta according to package instructions until al dente. Drain and set aside.
In a large skillet, heat the olive oil over medium-high heat. Season the sliced sirloin with salt and pepper, then add it to the skillet. Sear for about 3-4 minutes until browned. Remove the steak from the skillet and set aside.
In the same skillet, add the sliced onion, green bell pepper, and mushrooms. Sauté for about 5-7 minutes until they are softened. Add the minced garlic, dried oregano, and garlic powder, cooking for an additional minute until fragrant.
Pour in the beef broth and bring it to a simmer. Add the heavy cream and stir everything together to combine.
Return the seared steak to the skillet, then add the cooked pasta to the mixture. Stir gently until everything is well coated in the creamy sauce.
Sprinkle both provolone and Parmesan cheese over the pasta and mix until the cheeses are melted and creamy throughout the dish.
Taste and adjust seasoning with additional salt and pepper if needed.
Remove from heat and allow to cool slightly before serving.
Notes
Serve in shallow bowls, garnished with extra cheese on top and a sprinkle of chopped parsley for color.