Combine chicken, onion powder, garlic powder, tomatoes, celery, carrots, potatoes, chicken broth and water in large pot. Bring to a boil over high heat. Reduce to low and simmer 15-20 minutes, until veggies are tender. Add frozen veggies, Mrs. Dash, and pepper. Cook 10-15 minutes until heated through. Serve immediately or freeze. Reheat on stovetop or microwave until hot.