01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - In a large bowl, combine the ground chicken, grated onion, minced garlic, chopped parsley, egg, breadcrumbs, milk, salt, pepper, smoked paprika, and dried oregano.
03 - Mix gently until just combined. Avoid overmixing to keep the meatballs tender and juicy.
04 - Wet your hands to prevent sticking, then form the mixture into balls using about 1 heaping tablespoon each. Arrange evenly on the prepared baking sheet.
05 - Bake for 18–20 minutes until the meatballs are golden brown and cooked through to an internal temperature of 165°F.
06 - Serve immediately with warmed marinara sauce and garnish with fresh chopped parsley.