Preheat oven to 350°.
To prepare salad, arrange bread cubes in a single layer on a baking sheet. Lightly coat bread cubes with cooking spray. Bake at 350° for 15 minutes or until golden brown, stirring once. Set aside.
Place tomato, chicken, cucumber, bell pepper, onion, and parsley in a large bowl; toss gently to combine.
To prepare dressing, combine the juice and remaining ingredients, stirring with a whisk. Drizzle over salad, tossing gently to coat. Stir in bread cubes; let stand for 5 minutes. Serve immediately.