Creamy Pasta Shells with Sausage

1. Cook Pasta: Bring a large pot of salted water to a boil. Add the pasta shells and cook according to package directions until al dente. Drain and set aside.
2. Cook Sausage: While the pasta cooks, heat olive oil in a large skillet or Dutch oven over medium-high heat. Add the Italian sausage and cook, breaking it up with a spoon, until browned and cooked through, about 5-7 minutes. Drain any excess grease.
3. Sauté Aromatics: Add the chopped onion to the skillet with the sausage. Cook until softened, about 3-5 minutes. Stir in the minced garlic and cook for another minute until fragrant.
4. Simmer Sauce: Stir in the undrained diced tomatoes, salt, and pepper. Bring to a simmer, then reduce heat to low and cook for 5 minutes, allowing the flavors to meld.
5. Finish Dish: Stir in the heavy cream and Parmesan cheese until melted and combined. Add the cooked pasta shells to the skillet and toss to coat everything in the creamy sauce. Stir in the fresh parsley.
6. Serve: Serve immediately, garnished with additional Parmesan cheese and fresh parsley, if desired.