Step 1: Bring a large pot of salted water to a boil. Cook the spaghetti according to package instructions until al dente. Drain, reserving ½ cup of pasta water, then set the spaghetti aside.

Step 2: While the pasta cooks, heat the olive oil in a large skillet over medium-high heat. Add the thinly sliced beef and sprinkle with Cajun seasoning. Sear for 3–4 minutes until nicely browned and cooked through. Remove the beef from the skillet and set aside.

Step 3: In the same skillet, melt the butter over medium heat. Add the minced garlic and sauté for 1–2 minutes until fragrant but not browned.

Step 4: Pour in the chicken broth and bring the mixture to a simmer. Add the heavy cream and allow the sauce to thicken for 3–4 minutes, stirring occasionally. Season with smoked paprika, salt, and black pepper.

Step 5: Add the cooked spaghetti to the skillet and toss well to coat the noodles in the creamy sauce. Add reserved pasta water as needed to loosen the sauce.

Step 6: Return the cooked beef strips to the skillet and toss everything together. Mix in the grated Parmesan cheese and sprinkle with chopped fresh parsley before serving immediately.