01 - Preheat oven to 400°F (200°C). 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 sauté an additional minute. Allow to cool slightly.
03 - In a large bowl, combine ground chicken, sautéed onion and garlic, chopped sage, dried thyme, salt, black pepper, and optional nutmeg.
04 - Incorporate the breadcrumbs and beaten egg. Mix gently until just combined; avoid overmixing.
05 - Using damp hands, portion mixture into balls with about 1 heaping tablespoon per ball. Arrange evenly on the prepared tray.
06 - Brush or drizzle remaining olive oil over the chicken balls. Bake for 20 to 25 minutes, turning halfway, until golden brown and internal temperature reads 165°F (74°C).
07 - Serve hot, accompanied by your preferred dip or as part of a main meal.