Crockpot Chicken Chow Mein (2)

1 (4 oz) Can mushrooms
1 1/2 Pounds chicken thighs, boneless, skinless
4 Celery stalks
2 Medium onions
1 Can water chestnuts, sliced
1 Cup hot water with 3 chicken bouillon cubes
3 Tablespoons soy sauce
2 Teaspoons oyster sauce
2 Teaspoons Worcestershire sauce
1/8 Teaspoon ground ginger
1 (1 lb) Can Chinese vegetables
2 Tablespoons cornstarch
2 Tablespoons water

Cook on LOW for 8 to 10 hours in crockpot. One hour before serving add Chinese vegetables, cornstarch and water.