01 - Preheat oven to 400°F. Line a baking tray with parchment paper or grease lightly with oil.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Cook diced onion for 3 to 4 minutes until softened. Add minced garlic and sauté for 1 minute more. Allow mixture to cool slightly.
03 - In a large bowl, combine ground chicken, sautéed onion and garlic, sage, thyme, salt, black pepper, and nutmeg if using.
04 - Incorporate breadcrumbs and lightly beaten egg into the mixture. Mix gently until just combined, avoiding overmixing.
05 - With damp hands, portion and shape the mixture into balls, using about 1 heaping tablespoon for each. Arrange evenly on the prepared tray.
06 - Brush or drizzle the chicken balls with the remaining olive oil. Bake for 20 to 25 minutes, turning halfway through, until golden brown and fully cooked to an internal temperature of 165°F.
07 - Serve the chicken balls hot, accompanied by your preferred dipping sauce or as a main course.