01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease the surface.
02 - In a large mixing bowl, combine the ground chicken, grated onion, minced garlic, chopped parsley, egg, breadcrumbs, milk, salt, black pepper, smoked paprika, and dried oregano.
03 - Fold the mixture gently until just combined. Avoid overmixing to keep the meatballs tender and juicy.
04 - Wet your hands to prevent sticking, then shape the mixture into balls using roughly 1 heaping tablespoon per meatball. Arrange them evenly on the prepared baking sheet.
05 - Bake for 18 to 20 minutes, until the meatballs are golden brown on the outside and cooked through to an internal temperature of 165°F.
06 - Transfer to a serving plate and accompany with warmed marinara sauce and a sprinkle of fresh parsley if desired.