In a large bowl, combine the ground chicken, grated Parmesan cheese, breadcrumbs, egg, garlic oregano, parsley, paprika, salt and pepper.
Use your hands to combine everything until the mixture is well blended and then form the mixture into small meatballs, making about 12.
In a large skillet over medium heat, pour the marinara sauce and carefully place the chicken meatballs into the marinara sauce.
Cover the skillet and allow them to cook for 12-15 minutes, then uncover the skillet and turn over the meatballs to allow them to cook on the other side covered for 3-5 more minutes.
Preheat the oven to 400°F.
Add cooked spaghetti to a shallow oven-safe dish. Transfer the marinara sauce and the chicken meatballs on top of the spaghetti and add mozzarella cheese on top. Bake for 5 minutes until the cheese melts.
Serve immediately, garnished with parsley, if desired.