1. Bring a large pot of salted water to a boil and cook the penne pasta until al dente. Drain and reserve ½ cup of the pasta water.

2. Season sliced steak with 1 tablespoon Cajun seasoning, salt, and pepper.

3. Heat olive oil in a large skillet over medium-high heat. Sear the steak slices for 2–3 minutes per side until browned. Remove and set aside.

4. In the same skillet, reduce heat to medium and melt the butter.

5. Add minced garlic and sauté for 30 seconds until fragrant. Stir in remaining Cajun seasoning and red pepper flakes.

6. Pour in heavy cream and stir well. Let simmer for 3–4 minutes until slightly thickened.

7. Stir in grated Parmesan cheese and mix until the sauce is creamy and smooth.

8. Add the cooked penne pasta to the sauce and toss to coat evenly. Use reserved pasta water to adjust consistency if needed.

9. Return the steak to the skillet and combine gently with the pasta and sauce.

10. Let everything heat through for 1–2 minutes, then garnish with chopped parsley. Serve immediately.