Sauté chicken according to package directions, when chicken is fully cooked remove from pan.
Place cooked chicken in a food processor to break meat apart into smaller pieces. (May rough chop chicken on cutting board if desired.)
Add 1 tbsp. oil to pan used for chicken, add minced garlic, diced onions, grated ginger, green and red peppers, sauté 2 to 3 minutes or until onions are translucent.
In a small bowl mix Hoisin sauce, soy sauce, rice vinegar and cornstarch.
Add sauce mixture to sautéed vegetables, heat until sauce is thickened, then add chopped cooked chicken, sliced green onions and chopped water chestnuts to pan and heat through.
Remove from pan and keep warm.
Serve in lettuce leaves. May also be served over white rice or soba noodles. Garnish with Peanut Sauce and chopped peanuts.