Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the chicken breast into uniform 1-inch cubes and chop the zucchini and bell pepper into bite-sized pieces.
Rinse and drain the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure they become crispy during roasting.
In a large mixing bowl, combine the chicken, chickpeas, zucchini, and bell peppers.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and dried oregano, tossing until everything is evenly coated.
Spread the mixture in a single layer on the prepared baking sheet, making sure not to crowd the ingredients so they roast rather than steam.
Roast for 20 to 25 minutes, tossing the medley halfway through, until the chicken is cooked through and the chickpeas are golden.
Remove from the oven and immediately drizzle with fresh lemon juice to brighten the flavors before serving.