Preheat the oven to 350°F (175°C).
In a large mixing bowl, combine ground chicken, Italian seasoned breadcrumbs, grated Parmesan cheese, chopped onion, minced garlic, and chopped fresh parsley.
In a separate small bowl, whisk together the eggs and milk until well combined.
Pour the egg and milk mixture into the large bowl with the chicken mixture.
Add salt, black pepper, dried oregano, dried basil, and crushed red pepper flakes to the mixture.
Using your hands or a spoon, gently mix all ingredients until just combined, being careful not to overmix.
Transfer the mixture to a loaf pan or shape into a loaf on a baking sheet lined with parchment paper.
Spread the marinara sauce evenly over the top of the meatloaf.
Bake in the preheated oven for 50 minutes, or until the internal temperature reaches 165°F (74°C) and the meatloaf is cooked through.
Remove from the oven and let the meatloaf rest for 10 minutes before slicing and serving.