Preheat oven to 400F. Cut chicken breast into bite sized cubes. Cube bell pepper and onion and chop broccoli florets into smaller bites if they are large. Place the chicken and cut veggies in a large mixing bowl.
Whisk together olive oil, balsamic vinegar, honey, salt, garlic powder and dried oregano. Pour marinade over the chicken and veggies and toss to coat.
Pour chicken and veggies onto a parchment lined baked sheet. Bake at 400F for 16 minutes and then broil for 2-3 minutes to lightly crisp the edges of the chicken and veggies.
Ensure that the chicken reaches an internal temp of 165F and enjoy!