Preheat the oven to 375ºF and prepare a large baking sheet with nonstick spray.
In a large bowl, combine the chicken, peppers, and onions with the marinade. Toss to coat evenly. Marinate for 15 to 30 minutes if time allows.
Spread the mixture on the baking sheet and roast for 15 to 20 minutes until the chicken is cooked through and veggies are softened. Optional: Broil for 3 to 5 minutes for a charred finish.