Step 1: Prepare the Pasta Foundation

Begin by bringing a large pot of generously salted water to a rolling boil. The water should taste like seawater – this is crucial for properly seasoned pasta. Add the rigatoni pasta and cook according to package directions until al dente, typically 10-12 minutes. The pasta should have a slight bite to it as it will continue cooking when combined with the sauce. Before draining, reserve ½ cup of the starchy pasta cooking water – this liquid gold will help bind the sauce to the pasta if needed. Drain the pasta thoroughly and set aside.

Step 2: Season and Prepare the Steak

While the pasta cooks, pat the steak tips completely dry with paper towels – this step is essential for achieving a proper sear. In a large bowl, combine the Cajun seasoning, garlic powder, smoked paprika, salt, and freshly ground black pepper. Toss the steak tips with this seasoning blend, ensuring each piece is evenly coated. Allow the seasoned meat to rest at room temperature for 5-10 minutes, which helps the flavors penetrate and ensures even cooking.

Step 3: Sear the Steak Tips to Perfection

Heat olive oil in a large, heavy-bottomed skillet over medium-high heat until it shimmers and just begins to smoke. Working in batches if necessary to avoid overcrowding, add the seasoned steak tips to the hot pan. Sear for 3-4 minutes per side, developing a beautiful golden-brown crust while maintaining a tender, juicy interior. During the last minute of cooking, add 1 tablespoon of butter to the pan and baste the steak tips with the foaming butter for extra richness and flavor. Remove the steak tips to a plate and tent with foil to keep warm.

Step 4: Create the Aromatic Base

In the same skillet (don’t clean it – those browned bits are flavor gold), reduce heat to medium and melt 2 tablespoons of butter. Add the minced garlic and sauté for about 1 minute until fragrant but not browned. The residual heat and fond from the steak will infuse incredible depth into this aromatic base.

Step 5: Build the Luxurious Cheese Sauce

Pour in the heavy cream and whole milk, stirring to combine and scrape up any browned bits from the bottom of the pan. Add the softened cream cheese, whisking continuously until it’s completely melted and incorporated. Gradually add the freshly grated Parmesan cheese and shredded mozzarella, whisking constantly to prevent lumps. Season with ½ teaspoon Cajun seasoning, salt, and pepper. Continue whisking until the sauce is smooth, thick, and luxuriously creamy.

Step 6: Bring It All Together

Add the cooked rigatoni to the cheese sauce, tossing gently until each piece of pasta is beautifully coated. Carefully fold in the seared Cajun steak tips, being gentle to maintain their perfect texture. Allow everything to simmer together for 2-3 minutes, letting the flavors meld and the sauce cling to every surface. If the sauce seems too thick, add a splash of the reserved pasta water to achieve the perfect consistency.