In a large pot of salted boiling water, cook rigatoni according to package directions until al dente. Reserve 1/2 cup of pasta water, then drain the rest and set aside.
In a large skillet over medium heat, add olive oil. Remove the sausage from its casing and crumble it into the skillet. Cook until browned and cooked through, about 5-7 minutes.
Add the chopped onion to the skillet with the sausage. Sauté for 3-4 minutes until the onion is translucent. Stir in the minced garlic and cook for an additional minute until fragrant.
Pour in the chicken broth and bring to a simmer. Reduce heat and add the heavy cream, stirring well to combine. Let it simmer for 2-3 minutes until slightly thickened.
Stir in the cooked rigatoni and Parmesan cheese. If the sauce is too thick, add reserved pasta water, a little at a time, until the desired consistency is reached. Season with dried Italian herbs, salt, and pepper to taste.
Remove from heat, garnish with chopped parsley, and serve immediately.
Notes
Serve in deep bowls topped with extra Parmesan and a sprinkle of fresh parsley for a pop of color. You can also drizzle a little olive oil on top for added richness.