Cut chicken breast into strips and mince garlic. Chop scallions, onion, cilantro and mushrooms.
In a medium skillet combine chicken, scallions, garlic, canola oil, sesame oil, rice vinegar, hoisin sauce and Chinese Five Spices seasoning. Cook over medium-low heat for 15 minutes, stirring several times.
Remove chicken to a serving bowl. Place 1/4-cup chicken on each lettuce leaf. Top with 1-2 teaspoon each red onion, mushroom, red bell pepper and cilantro or parsley. Wrap lettuce around chicken mixture and pick up to eat. You may also wrap them in food-grade paper to make them hold together better.