Add ground turkey to the skillet, brown the meat, and season with half the salt, black pepper, and Italian seasoning. Add garlic last to prevent burning.
Sprinkle the flour over the turkey and onions, stirring for about 1 minute.
Pour in chicken broth and tomato sauce. Bring to a simmer and let cook for 5-10 minutes.
Add cooked pasta back into the skillet with half and half, mixing gently.
Mix in half the shredded cheese, topping with the rest and covering the skillet until melted.
Garnish with parsley and red chili flakes, then serve hot.
Notes
Make sure to reserve pasta water for adjusting sauce consistency.