Preheat the oven to 425 degrees.
Line a baking sheet with parchment paper and lay out the broccoli, onions, peppers, and carrots. Spray generously with cooking spray and season with garlic powder, salt, and pepper.
Roast for 30 minutes, remove the broccoli and set aside in a large mixing bowl, and let cook another 10 minutes or until carrots are fork tender.
Slice the vegetables to roughly chop up.
After about 30 minutes, cook the orzo according to package directions.
Add the orzo to the bowl with the vegetables and season very generously with salt and pepper or per your preference. Serve.