Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper if desired.
In a large mixing bowl, combine the ground chicken, bread crumbs, grated Parmesan cheese, chopped parsley, minced garlic, egg, salt, black pepper, and Italian seasoning. Mix well until all ingredients are evenly incorporated.
Form the mixture into meatballs, approximately 1.5 inches (4 cm) in diameter, and place them on the prepared baking sheet.
Drizzle olive oil over the meatballs to help with browning.
Bake the meatballs in the preheated oven for about 20-25 minutes, or until golden brown and cooked through.
While the meatballs are baking, heat the marinara sauce in a skillet over medium heat.
Once the meatballs are done, add them to the skillet with the marinara sauce, gently coating them with the sauce. Allow them to simmer for a few minutes.
Serve the meatballs with your choice of pasta or on their own, garnished with additional parsley if desired.