Preheat large nonstick skillet over medium heat. Add in olive oil, onions and garlic. Cook until softened, 3 minutes. Add in ground chicken, zucchini, carrot, salt and pepper. As the meat cooks, break it apart into crumbles.
While the meat is cooking, stir all ingredients for the sauce together in a small bowl.
Once chicken is thoroughly cooked, pour in sauce and cover to simmer 5-7 minutes.
Right before serving, stir in bean sprouts, scallions, cashews and cilantro. Scoop into butter lettuce cups and serve.