1. Bring a large pot of salted water to a boil. Cook the bow tie pasta until al dente according to package instructions. Drain and set aside.

2. In a large skillet over medium heat, add olive oil and crumble in the Italian sausage. Cook until browned and no longer pink, breaking it up with a spoon. Remove excess grease if needed.

3. Stir in chopped onion and cook until softened, about 3-4 minutes. Add minced garlic, red pepper flakes, and Italian seasoning. Cook for 1 minute until fragrant.

4. Pour in the diced tomatoes and tomato sauce. Stir and let the mixture simmer for 5-7 minutes to blend the flavors.

5. Lower the heat and stir in the heavy cream and Parmesan cheese. Let it simmer gently until the sauce thickens slightly. Season with salt and pepper to taste.

6. Add the cooked pasta to the skillet and toss to coat it evenly with the sauce. Warm through for 2-3 minutes.

7. Serve hot, garnished with fresh basil or parsley and extra Parmesan if desired.