Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Drain and rinse the chickpeas, then pat them thoroughly dry with a paper towel to ensure they crisp up in the oven.
Cut the chicken breast into uniform 1-inch bite-sized pieces to ensure even cooking.
In a large mixing bowl, combine the chicken, chickpeas, broccoli florets, and chopped red bell pepper.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and dried oregano, tossing well to coat every piece.
Spread the mixture in a single layer on the prepared sheet pan, ensuring nothing is overcrowded.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the chickpeas are golden brown.
Remove from the oven and immediately drizzle with fresh lemon juice and sprinkle with crumbled feta cheese before serving.