Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Dice the chicken breast into uniform 1-inch cubes to ensure even cooking throughout the tray.
Rinse and drain the chickpeas thoroughly, then pat them dry with a paper towel to help them achieve a crisp texture.
Chop the red bell pepper and zucchini into bite-sized pieces similar in size to the chicken.
In a large mixing bowl, whisk together the olive oil, fresh lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken, chickpeas, and chopped vegetables to the bowl and toss until every piece is well-coated in the zesty marinade.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the ingredients are not overcrowded.
Roast for 18-20 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and let the medley rest for 2 minutes before serving warm.