01 - Preheat oven to 400°F. Line a baking tray with parchment paper or lightly grease with oil.
02 - In a skillet, heat 1 tablespoon olive oil over medium heat. Sauté diced onion for 3 to 4 minutes until softened. Add minced garlic and cook 1 minute longer. Allow mixture to cool slightly.
03 - In a large mixing bowl, combine ground chicken, sautéed onion and garlic, fresh or dried sage, thyme, salt, black pepper, and optional nutmeg. Mix well.
04 - Add breadcrumbs and lightly beaten egg to the bowl. Mix gently until just combined, taking care not to overmix.
05 - With damp hands, shape the mixture into balls using about 1 heaping tablespoon each. Place evenly on the prepared baking tray.
06 - Brush or drizzle the remaining olive oil over the formed balls.
07 - Bake in the preheated oven for 20 to 25 minutes, turning halfway through, until golden brown and fully cooked. Internal temperature should reach 165°F.
08 - Serve hot as an appetizer or main, accompanied by your preferred sauce or side.