Add the diced tomatoes, Italian seasoning, red pepper flakes, salt, and pepper. Simmer for about 10 minutes to allow the flavors to blend.

Step 5: Finish the Sauce
Return the sausage to the pot and stir in the fresh parsley. Cook for an additional 5 minutes. Meanwhile, prepare the egg noodles according to package directions.

Step 6: Combine and Serve
Drain the noodles and add them to the sauce. Toss until evenly coated, then serve hot.