Heat taco shells as directed on package.
Meanwhile, spray large nonstick skillet with nonstick cooking spray. Heat over medium-high heat until hot. Add chicken, gingerroot and garlic; cook and stir 3 to 5 minutes or until lightly browned.
Reduce heat to low. Add soy sauce, honey, onion and crushed red pepper flakes; stir to coat. Cover; cook 5 minutes or until chicken is no longer pink in center, stirring occasionally.
Place about 1/4 cup chicken mixture in each taco shell. Top each with lettuce.