01 - Combine soy sauce, fish sauce, oyster sauce, brown sugar, grated ginger, and lime juice in a small bowl. Mix thoroughly and set aside.
02 - Heat vegetable oil in a large skillet or wok over medium-high heat. Add garlic and onion, sautéing until fragrant and translucent, approximately 2 minutes.
03 - Add ground chicken to the skillet. Cook, breaking up with a spatula, until fully cooked and lightly browned, about 5 minutes.
04 - Stir in bell pepper, carrot, green onions, and chili if using. Cook for another 3-4 minutes until vegetables are tender-crisp.
05 - Pour the prepared sauce over the chicken mixture. Toss to combine and cook for an additional 2 minutes to allow flavors to meld.
06 - Remove the mixture from heat. Spoon the filling into individual lettuce leaves and garnish with cilantro, mint, chopped peanuts, and extra lime wedges as desired.