01 - Preheat oven to 400°F. Line a baking tray with parchment paper or lightly grease it.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Sauté diced onion for 3–4 minutes until softened; add minced garlic and cook 1 minute more. Remove from heat and allow to cool slightly.
03 - In a large mixing bowl, blend ground chicken, cooled onion and garlic mixture, sage, thyme, salt, black pepper, and optional nutmeg until evenly distributed.
04 - Stir in breadcrumbs and the lightly beaten egg. Mix gently until just combined, taking care not to overwork the mixture.
05 - With damp hands, shape the mixture into balls using about 1 heaping tablespoon of mixture per ball. Arrange on the prepared baking tray.
06 - Lightly brush or drizzle the chicken balls with the remaining olive oil.
07 - Bake for 20–25 minutes, turning halfway through, until golden brown and cooked through to an internal temperature of 165°F.
08 - Serve the chicken balls hot with your preferred dip or as part of a main meal.