Preheat oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast, zucchini, and bell pepper into bite-sized 1-inch pieces.
Rinse and drain the chickpeas, then pat them dry with a clean towel to ensure they get crispy.
In a large bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, sea salt, and black pepper.
Add the chicken, chickpeas, and vegetables to the bowl and toss until everything is evenly coated in the marinade.
Spread the mixture in a single layer on the prepared baking sheet, ensuring nothing is overcrowded.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the vegetables are tender and slightly charred.
Remove from the oven and serve immediately for a high-protein, clean-eating meal.