Brown the Chorizo: In a large pot or Dutch oven, cook the pork chorizo over medium-high heat. Stir it occasionally until it's nicely browned and slightly thick, which usually takes about 5-7 minutes. For an added healthy boost, you can stir in chopped bell peppers or onions during this step and sauté them until softened.
Build the Flavor Base: Add the tomato sauce, the entire can of undrained fire-roasted diced tomatoes, tomato paste, salt, Italian seasoning, and garlic powder to the pot. Stir everything thoroughly to mix the flavors.
Add Pasta & Liquids: Toss the rigatoni pasta into the pot. Pour in the low-sodium chicken broth and water (feel free to use all broth for a deeper taste). Make sure the liquid fully covers the pasta; add a little more water or broth if needed. Bring the mixture to a brisk boil.
Simmer to Perfection: Once boiling, reduce the heat to a gentle simmer. Cover the pot and let it cook for 12 to 15 minutes, or until the pasta is cooked through to your preferred tenderness (al dente is recommended!).
Finish & Serve: Remove the pot from the heat. Stir in the ¼ cup of shredded Parmesan cheese until it melts and combines into a creamy sauce. Serve this delicious one-pot pasta immediately, garnishing with fresh parsley, basil, red pepper flakes, and a sprinkle of extra Parmesan cheese, if desired.