Preheat oven to 425 degrees. Spray a 13x9 pan with cooking spray.
Add all the vegetables to the pan.
Sprinkle with thyme and drizzle with olive oil and toss to coat. Make sure all the vegetables are lightly coated in olive oil. Roast for 30 minutes.
Remove from oven. Pour in the chicken broth and toss vegetables to coat. Return to oven and roast for another 20-30 minutes or until all the vegetables can easily be pierced with a fork.