Cook the Pasta
Bring a large pot of salted water to boil and cook pasta according to package directions until al dente. This typically takes 8-10 minutes, but timing varies by pasta shape. Test for doneness by tasting - the pasta should have a slight firmness in the center. Drain well and set aside, but avoid rinsing to keep the starch that helps sauce adhesion.
Brown the Kielbasa
Cut kielbasa into 1/4-inch rounds. In a large skillet over medium-high heat, cook kielbasa slices until nicely browned on both sides, about 5-6 minutes total. The sausage will develop a caramelized exterior that adds flavor to the dish. Remove from pan and set aside on a paper towel-lined plate to absorb excess oil.
Prepare the Garlic Base
In the same skillet, reduce heat to medium and melt the stick of butter. Add minced garlic and cook for 30 seconds until fragrant, stirring constantly to prevent burning. The butter will take on a nutty aroma and the garlic will become golden but not brown.
Create the Cream Sauce
Slowly pour in heavy cream while stirring constantly. Add salt, pepper, garlic powder, and Italian seasoning. Stir well and let simmer for 2-3 minutes. The cream will begin to thicken slightly as it reduces, concentrating the flavors and creating the base for your alfredo sauce.
Add the Cheese
Gradually add the Parmesan cheese while stirring continuously until the sauce thickens to your desired consistency. This should take about 3-4 minutes. Adding the cheese slowly prevents clumping and ensures a smooth, velvety sauce. The heat should be medium-low to avoid breaking the sauce.
Combine Pasta and Sauce
Add the cooked pasta to the alfredo sauce and toss to coat evenly. Use tongs or a pasta spoon to ensure every piece of pasta is thoroughly covered with the creamy sauce. If the sauce seems too thick, add a splash of the reserved pasta water to loosen it.
Add Kielbasa and Serve
Top with the browned kielbasa and gently stir to combine everything. Serve immediately while hot. Top each serving with extra Parmesan cheese and a sprinkle of dried parsley for color and flavor. The contrast of the creamy pasta with the smoky sausage creates a perfect balance of flavors.