Bring a large pot of salted water to a rolling boil over high heat. Add 12 ounces of twisted pasta and cook according to the package instructions until al dente, usually about 8-10 minutes. Drain the pasta in a colander and set it aside, allowing it to cool slightly while you prepare the savory steak bites.

In a large skillet, heat 3 tablespoons of olive oil over medium-high heat until shimmering. Season 1.5 pounds of sirloin steak, cut into bite-sized pieces, with salt and pepper. Add the steak bites to the hot skillet in a single layer and sear for 3-4 minutes until browned on one side. Flip and continue cooking for an additional 2-3 minutes until they are medium-rare. Remove the steak from the skillet and set aside.

In the same skillet, reduce the heat to medium and add 4 tablespoons of butter. Allow it to melt completely, then stir in 1 cup of heavy cream and 2 tablespoons of Cajun seasoning. Continue to cook the mixture for about 2-3 minutes, stirring frequently until the sauce thickens slightly and becomes creamy.

Add the cooked twisted pasta to the skillet of spicy Cajun Alfredo sauce, stirring well to coat the pasta evenly. Gradually mix in 1/2 cup of grated Parmesan cheese, allowing it to melt and enrich the sauce. Gently fold the seared steak bites back into the skillet.

Spoon the Creamy Garlic Butter Steak Bites with Spicy Cajun Alfredo Twisted Pasta onto warm plates. Garnish with additional Parmesan cheese and a sprinkle of parsley if desired. Serve immediately.