Cook the penne pasta according to package instructions until al dente. Drain and set aside, reserving 1/2 cup of pasta water.
In a large skillet, heat the olive oil over medium heat. Add the Italian sausage and cook until browned, breaking it up with a spoon, about 5-7 minutes.
Add the minced garlic to the skillet and sauté for an additional 1-2 minutes until fragrant.
Pour in the heavy cream and chicken broth, stirring to combine. Bring the mixture to a gentle simmer.
Stir in the grated Parmesan cheese and Italian seasoning, mixing until the cheese is melted and the sauce is creamy.
Add the cooked penne pasta to the skillet, tossing to coat the pasta in the sauce. If the sauce is too thick, add reserved pasta water a little at a time until desired consistency is reached.
Season with salt and pepper to taste. Remove from heat and garnish with chopped parsley before serving.