Slow Cooker Chop Suey Chicken

2 Tbsp cooking oil
6 chicken breasts, skin and bones removed
1 carrot, diced
1 medium yellow onion, chopped
2 stalks celery, chopped
1 cup chicken broth
1/4 cup soy sauce
1/4 tsp crushed red pepper flakes
1 garlic clove, grated
1 can (8 oz) bamboo shoots, drained
1 can (8 oz) sliced water chestnuts, drained
1/4 cup cornstarch
1/2 cup COLD water
hot cooked rice for serving

Put a large heavy skillet on medium-high heat, add oil and chicken, browning chicken quickly; put chicken in crockpot.
Add remaining ingredients EXCEPT cornstarch and water.
Cover and cook on LOW for 6 to 7 hours.
In a bowl, stir together the cornstarch and cold water, then stir into the mixture in the crockpot, cover the crockpot and allow to cook for another 10 to 15 minutes or until sauce thickens.
Serve over rice.
Serves 6 to 8.