Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized cubes and ensure the chickpeas are rinsed and patted very dry for maximum crispness.
Chop the bell peppers and slice the zucchini into half-moons.
Place the chicken, chickpeas, and vegetables onto the prepared baking sheet.
Drizzle with olive oil and sprinkle evenly with garlic powder, dried oregano, sea salt, and black pepper.
Toss everything together directly on the pan until well-coated, then spread into a single layer.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the vegetables are tender with golden edges.
Remove from the oven and drizzle with fresh lemon juice before serving.