Slow Cooker Chicken Chow Mein

1 tablespoon vegetable oil

2 medium carrots, sliced diagonally (1 cup)

2 medium stalks celery, coarsely chopped (1 cup)

1 medium onion, chopped (1/2 cup)

2 cloves garlic, finely chopped

1 cup Progresso® chicken broth (from 32-oz carton)

2 tablespoons soy sauce

1/2 teaspoon finely chopped gingerroot

2 tablespoons cornstarch

3 tablespoons cold water

1 cup fresh broccoli florets

1 cup fresh snow pea pods

6 cups chow mein noodles