Preheat your oven to 400°F (200°C).
In a large mixing bowl, combine the ground chicken, panko bread crumbs, milk, garlic, shallot, ginger, egg, soy sauce, salt, and pepper. Mix until just combined.
Use your hands to form the mixture into meatballs, about 1.5 inches in diameter. Place them on a baking sheet lined with parchment paper.
Bake the meatballs for 20-25 minutes, or until they are cooked through and golden brown.
While the meatballs are baking, heat vegetable oil and sesame oil in a small saucepan over medium heat. Add garlic and ginger, sauté for about 1 minute.
Add oyster sauce, soy sauce, and honey to the saucepan. Mix cornstarch with water and stir into the saucepan. Cook until the sauce thickens.
Toss the cooked meatballs in the sweet oyster sauce until well coated. Serve in Boston lettuce leaves with garnishes.