01 - Preheat oven to 400°F and line a baking sheet with parchment paper or lightly grease with oil.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Add diced onion and cook for 3 to 4 minutes until softened. Add minced garlic and continue cooking for 1 minute. Remove from heat and let cool slightly.
03 - In a large mixing bowl, combine ground chicken, sautéed onion and garlic, chopped sage, dried thyme, salt, black pepper, and optional nutmeg.
04 - Add breadcrumbs and beaten egg to the bowl. Gently mix until all ingredients are just combined; take care not to overmix.
05 - With damp hands, form the mixture into balls using about 1 heaping tablespoon per ball. Place the balls on the prepared baking sheet.
06 - Brush or drizzle the remaining 1 tablespoon olive oil over the chicken balls. Bake for 20 to 25 minutes, turning once halfway through, until golden brown and cooked through. Internal temperature should reach 165°F.
07 - Serve hot with your preferred dipping sauce or as part of a main meal.