01 - Preheat oven to 400°F. Line a baking tray with parchment paper or apply a light coating of oil.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Sauté diced onion for 3 to 4 minutes until softened. Stir in minced garlic and cook 1 additional minute. Allow to cool slightly.
03 - In a large mixing bowl, combine ground chicken, sautéed onion and garlic, sage, thyme, salt, black pepper, and nutmeg if using.
04 - Add breadcrumbs and beaten egg to the chicken mixture. Mix gently until just combined; avoid overmixing.
05 - With damp hands, 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.
07 - Bake in the preheated oven for 20 to 25 minutes, turning halfway through, until golden brown and thoroughly cooked. Confirm an internal temperature of 165°F.
08 - Serve hot, accompanied by your choice of dip or as part of a meal.