Preheat oven to 475° F. Spray a large baking sheet with cooking spray.
Chop all the veggies into large (around one inch) pieces. On a separate plate or cutting board chop all the chicken in large cubes.
Place the chicken and veggies on the prepared baking sheet. Add the olive oil, salt, pepper, Italian seasoning and Mrs. Dash seasoning. Toss to combine.
Bake for 20 to 25 minutes or until the veggies are charred and chicken is cooked through. Internal chicken temperature should be at least 165 degrees F.
Serve immediately and enjoy!