Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Chop the zucchini, red bell pepper, and red onion into uniform bite-sized pieces to ensure even roasting.
Place the chicken breast, chopped vegetables, and rinsed chickpeas onto the prepared baking sheet.
Drizzle the olive oil and lemon juice over the chicken and vegetables, then sprinkle evenly with dried oregano, garlic powder, sea salt, and black pepper.
Toss all ingredients together on the pan until everything is well-coated in the oil and spice mixture.
Spread the ingredients into a single layer, ensuring the chicken breast has enough space around it to roast rather than steam.
Bake for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly charred.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into strips.
Serve the sliced chicken over the roasted vegetable and chickpea mixture, drizzling any remaining pan juices over the top.