Bring a large pot of salted water to a boil. Cook the pasta according to package instructions until al dente. Reserve ½ cup of pasta water, then drain and set aside.
In a large skillet, heat olive oil over medium heat. Add minced garlic and sauté until fragrant. Stir in the marinara sauce, Italian seasoning, and red pepper flakes. Let it simmer for 3-4 minutes.
Lower the heat and pour in the heavy cream, stirring continuously. Add Parmesan cheese and mix until melted and smooth. Season with salt and pepper to taste.
Add the cooked pasta to the sauce, tossing well to coat. If needed, add reserved pasta water a little at a time to reach the desired consistency.
Garnish with fresh basil and extra Parmesan before serving.