01 - Preheat oven to 400°F (200°C). Line a baking tray with parchment paper or lightly grease with oil.
02 - Warm 1 tablespoon olive oil in a skillet over medium heat. Sauté diced onion for 3 to 4 minutes until softened. Add garlic and cook 1 minute longer, then remove from heat and cool slightly.
03 - In a large mixing bowl, place ground chicken, the sautéed onion and garlic, sage, thyme, salt, black pepper, and nutmeg if using.
04 - Incorporate breadcrumbs and the beaten egg. Mix gently until just combined to maintain tenderness.
05 - With damp hands, form the mixture into evenly-sized balls, using about one heaping tablespoon of mixture per ball. Arrange on the prepared tray.
06 - Brush or drizzle the remaining tablespoon of olive oil over the chicken balls. Bake for 20 to 25 minutes, turning halfway, until evenly golden and the internal temperature reaches 165°F (74°C).
07 - Serve warm, accompanied by your preferred dip or as part of your meal.