Slow Cooker Chicken Chow Mein With Water Chestnuts And Bean Sprouts

oil

boneless, skinless chicken breasts, cut in 1" pieces

carrots, thinly sliced

green onions, all parts, sliced

stalks celery, sliced

low-sodium chicken broth

sugar

light soy sauce

crushed red pepper flakes

ground ginger

garlic, crushed

sliced water chestnuts (increase this if desired)

bean sprouts, fresh preferred, canned works

cornstarch

water