01 - Preheat oven to 400°F (200°C). Line a baking tray with parchment paper or lightly grease the surface.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Sauté diced onion for 3 to 4 minutes until softened. Add minced garlic and cook for 1 additional minute. Allow mixture to cool slightly.
03 - In a large mixing bowl, combine ground chicken, sautéed onion and garlic, chopped sage, dried thyme, salt, pepper, and optional nutmeg.
04 - Add breadcrumbs and lightly beaten egg to the bowl. Mix gently until just combined, avoiding overmixing.
05 - With damp hands, shape the mixture into balls using about 1 heaping tablespoon per ball. Arrange evenly on the prepared baking tray.
06 - Brush or drizzle the chicken balls with the remaining 1 tablespoon olive oil.
07 - Bake for 20 to 25 minutes, turning halfway through, until golden brown and cooked through. Internal temperature should reach 165°F (74°C).
08 - Serve hot as an appetizer or main dish, accompanied by your choice of dipping sauce or side.