1. 1. Start by cooking the rigatoni according to the package instructions until it reaches the perfect al dente texture. Drain the pasta and set it aside, ready to be tossed with the delectable sauce.

2. 2. In a mixing bowl, toss the steak tips with the Cajun seasoning, salt, and pepper. This seasoning blend will infuse the steak with a bold, spicy-yet-balanced flavor that will complement the creamy parmesan sauce.

3. 3. Heat a large skillet over medium-high heat and add the olive oil and 1 tablespoon of butter. Once the pan is hot, add the seasoned steak tips and sear for 3-4 minutes per side, or until they reach your desired level of doneness. Remove the seared steak tips from the skillet and set them aside.

4. 4. In the same skillet, add the remaining 1 tablespoon of butter and the minced garlic. Sauté for 30 seconds, allowing the garlic to become fragrant. Then, pour in the heavy cream and bring the mixture to a gentle simmer. Gradually stir in the freshly grated Parmesan cheese, whisking continuously until the sauce becomes smooth and creamy.

5. 5. Add the cooked rigatoni and the seared steak tips to the creamy parmesan sauce. Toss everything together until the pasta is evenly coated in the rich, flavorful sauce. If desired, sprinkle the top with shredded mozzarella or Fontina cheese, allowing it to melt and create an irresistible cheesy layer.

6. 6. Serve the Cajun Steak Tips in Cheesy Rigatoni Parmesan Sauce hot, garnished with additional Cajun seasoning or freshly grated Parmesan cheese for an extra burst of flavor.