Chicken and Tortellini Stew

2 tablespoons cornstarch
2 tablespoons water
2 tablespoons vegetable oil
3/4 pound skinless, boneless chicken breast, cut into cubes
1 cup frozen sliced carrots
1 cup frozen cut green beans or peas
1 cup chopped celery
3/4 cup chopped onion
1 teaspoon Herb and Garlic dip mix
1 teaspoon garlic powder
6 cups Chicken Broth
1 cup dried cheese-filled tortellini
2 tablespoons chopped fresh parsley (optional)

Stir the cornstarch and water in a small cup until smooth. Set the mixture aside.
Heat oil in a 6-quart saucepot over medium-high heat. Add the chicken and cook until it's well browned, stirring often.
Add the carrots, beans and onions. Stir in the broth. Heat to a boil. Simmer 15 minutes. Add the tortellini and parsley, if desired. Cook for 10 minutes or until the tortellini is tender.
Stir the cornstarch mixture and stir it into the saucepot. Cook and stir until the mixture boils and thickens slightly.