Light Seafood Gumbo

Ingredients 4 (6 ounce) skinned chicken breast halves 2 quarts water 1/2 cup all-purpose flour Vegetable Cooking Spray 1 tablespoon vegetable oil 2 cups chopped onion 1 3/4 cups chopped celery 1 1/2 cups chopped green pepper 1/2 cup chopped green onions 4 cloves garlic, minced 1 1/2 teaspoons dried whole thyme 1 teaspoon dried