01 - Preheat your oven to 400°F (200°C). Line a baking tray with parchment paper or lightly oil to prevent sticking.
02 - In a skillet over medium heat, warm 1 tablespoon olive oil. Sauté diced onion for 3 to 4 minutes, until translucent. Add minced garlic and cook an additional minute. Set aside to cool slightly.
03 - In a large mixing bowl, combine ground chicken, sautéed onion and garlic, chopped sage, thyme, salt, pepper, and nutmeg if using.
04 - Add breadcrumbs and beaten egg to the mixture. Mix gently just until all ingredients are evenly incorporated. Avoid overmixing to ensure tenderness.
05 - With dampened hands, form the mixture into approximately 20 balls, each about one heaping tablespoon. Arrange them evenly on the prepared tray.
06 - Brush or drizzle the remaining olive oil over each ball for even browning.
07 - Bake in the preheated oven for 20 to 25 minutes, turning the balls halfway through, until golden brown and internal temperature reaches 165°F (74°C).
08 - Serve warm as an appetizer, with dipping sauces, or as part of a main course.