Step 1: Prepare the Ingredients

1. Bring a large pot of salted water to a boil. Add the pasta and cook until al dente according to the package instructions. Reserve ½ cup of pasta water and then drain the pasta.
2. Slice the sausage into bite-sized pieces, mince the garlic, and finely chop the onion.

Step 2: Cook the Sausage

1. Heat 1 tablespoon of olive oil in a large skillet over medium heat.
2. Add the sausage slices and cook until browned and slightly crispy, about 5-7 minutes. Remove the sausage and set aside.

Step 3: Sauté Aromatics

1. In the same skillet, add another tablespoon of olive oil. Toss in the minced garlic and chopped onion. Sauté for 2-3 minutes until softened and fragrant.
2. Sprinkle in the red chili flakes, smoked paprika, oregano, and basil. Stir for 1 minute to release their flavors.

Step 4: Build the Sauce

1. Pour in the crushed tomatoes and stir to combine. Season with salt and pepper to taste.
2. Let the sauce simmer for 8-10 minutes, stirring occasionally, until it thickens slightly.
3. For a creamy version, stir in the heavy cream and simmer for another 2 minutes.

Step 5: Combine Pasta and Sauce

1. Add the cooked pasta to the skillet, tossing well to coat every piece in the sauce. If the sauce is too thick, add a splash of the reserved pasta water to loosen it.
2. Return the cooked sausage to the pan and mix everything thoroughly. Cook for 2-3 minutes to allow the flavors to meld.

Step 6: Garnish and Serve

1. Transfer the spicy sausage pasta to serving plates or a large bowl.
2. Garnish with grated Parmesan cheese and fresh basil or parsley.
3. Serve hot with a side of garlic bread or a fresh salad, and enjoy!