Heat 1 Tbsp of oil in a large non-stick skillet over medium- high heat. Add chicken and sautee for about 4-5 minutes, or until cooked through, tossing occasionally. Transfer chicken to a plate.
While chicken is cooking, whisk together soy sauce, water, cornstarch and honey, set aside.
Heat remaining oil in the same skillet over medium- high heat. Add garlic, bell pepper, mushrooms, carrots and sauté for 3 minutes.
Pour the sauce into the skillet. Add chicken, toss and warm through.
Sprinkle with sesame seeds, green onions and serve over lettuce leaves.