01 - Preheat oven to 400°F (200°C). Line a baking tray with parchment paper or lightly grease with oil.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Sauté onion for 3 to 4 minutes until softened. Add garlic and cook for 1 additional minute. Remove from heat and allow to cool slightly.
03 - In a large mixing bowl, combine ground chicken, sautéed onion and garlic, sage, thyme, salt, pepper, and optional nutmeg.
04 - Fold in breadcrumbs and lightly beaten egg. Mix gently until the ingredients are just combined, taking care not to overwork the mixture.
05 - With damp hands, form mixture into balls using about 1 heaping tablespoon per piece and arrange on prepared baking tray.
06 - Brush or drizzle the tops of the chicken balls with the remaining 1 tablespoon of olive oil.
07 - Bake in preheated oven for 20 to 25 minutes, turning once halfway through, until golden and cooked through with an internal temperature of 165°F (74°C).
08 - Serve hot, with your choice of dipping sauce or as part of a meal.