01 - Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper and lightly brush with olive oil.
02 - In a large bowl, combine ground chicken, Parmesan cheese, breadcrumbs, minced garlic, egg, chopped parsley, dried oregano, salt, and black pepper. Mix until just incorporated.
03 - Using slightly damp hands, shape the mixture into 16 meatballs, approximately 1.25 inches (3 cm) in diameter. Arrange them on the prepared baking sheet.
04 - Lightly brush or spray the meatballs with olive oil. Bake for 18-20 minutes, or until they are lightly golden and cooked through.
05 - While the meatballs are baking, warm the marinara sauce in a large ovenproof skillet or baking dish over medium heat.
06 - Carefully transfer the baked meatballs into the warm marinara sauce, ensuring they are nestled within the sauce.
07 - Evenly sprinkle the shredded mozzarella cheese over the top of the meatballs and sauce. Return the skillet or dish to the oven (or broil) for an additional 10-12 minutes, until the cheese is fully melted and bubbly.
08 - Garnish with torn fresh basil leaves. Serve immediately with cooked spaghetti or crusty bread, if desired.