Preheat the oven to 375°F.
Add the halved potatoes, green beans, and broccoli to a large sheet pan. Drizzle with olive oil and season with salt, pepper, and 2 tablespoons of the CTH seasoning. Toss to coat and spread into an even layer.
In a bowl, toss the cubed chicken with a drizzle of olive oil, salt, pepper, the remaining 2 tablespoons of CTH, and the cornstarch until every piece is evenly coated.
Scatter the seasoned chicken over the top of the vegetables and potatoes on the sheet pan.
Bake at 375°F for 25 to 30 minutes until the vegetables are tender, the potatoes are cooked through, and the chicken is mostly cooked with a slightly crispy exterior.
Remove from the oven. Pour the orange sauce over everything and toss gently until the chicken, vegetables, and potatoes are evenly coated.
Return to the oven at 400°F for 5 to 7 minutes until the sauce is caramelized and slightly sticky and the chicken is completely cooked through.
Serve directly from the sheet pan.