Cook the rigatoni according to package instructions until al dente. Drain and set aside.
In a large skillet, heat olive oil over medium heat. Add chopped onion and sauté for 3-4 minutes until translucent. Then add minced garlic and cook for another 30 seconds.
Add ground beef to the skillet and cook until browned, breaking it apart with a spatula, about 5-7 minutes. Drain excess fat if necessary.
Pour in the chicken broth and bring to a gentle simmer for about 5 minutes.
Lower the heat and stir in the heavy cream and grated Parmesan cheese, mixing until smooth.
Add Italian seasoning, salt, and pepper to taste. Stir to combine.
Add the cooked rigatoni to the skillet and toss to coat the pasta in the creamy sauce.
Serve immediately, garnished with freshly chopped parsley.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stovetop.