Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Dice the chicken breast into 1-inch cubes and chop the red bell pepper and zucchini into similar bite-sized pieces.
Drain and rinse the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure they get crispy in the oven.
In a large mixing bowl, combine the chicken, chickpeas, peppers, and zucchini.
Drizzle the olive oil and lemon juice over the mixture, then sprinkle with sea salt, black pepper, dried oregano, and garlic powder.
Toss everything together until the ingredients are evenly coated in the oil and seasonings.
Spread the medley in a single layer on the prepared baking sheet, ensuring space between pieces for even roasting.
Roast for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the vegetables are tender with golden edges.
Remove from the oven and serve immediately while warm and fragrant.