Combine chicken, mushrooms, water chestnuts, green bell pepper, red bell pepper, onion, ginger, peanuts, teriyaki marinade, teriyaki sauce, olive oil, and honey in a slow cooker. Cook on High until heated through and chicken is no pink, 3 to 4 hours.
Serve chicken mixture on lettuce leaves with a couple of spoonfuls brown rice and drizzled with peanut sauce and ginger dressing.