01 - Preheat oven to 400°F. 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 diced onion for 3 to 4 minutes until softened, then add garlic and cook for 1 minute longer. Allow mixture to cool slightly.
03 - In a large mixing bowl, add ground chicken, sautéed onion and garlic, sage, thyme, salt, black pepper, and optional nutmeg.
04 - Add breadcrumbs and beaten egg to the bowl. Gently mix until just combined, avoiding overmixing.
05 - With damp hands, shape the mixture into balls, each about 1 heaping tablespoon in size. Place evenly on the prepared baking tray.
06 - Brush or drizzle the chicken balls with the remaining tablespoon of olive oil.
07 - Bake in the preheated oven for 20 to 25 minutes, turning halfway, until chicken balls are golden brown and fully cooked (internal temperature should reach 165°F).
08 - Serve chicken balls hot with your choice of dip or as part of a meal.