Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into even 1-inch cubes and place them in a large mixing bowl.
Add the rinsed chickpeas, broccoli florets, and chopped bell peppers to the bowl with the chicken.
Drizzle the olive oil over the mixture and sprinkle with sea salt, black pepper, garlic powder, and dried oregano.
Toss everything thoroughly until the chicken and vegetables are evenly coated in oil and spices.
Spread the mixture in a single layer on the prepared baking sheet, ensuring nothing is overcrowded.
Roast for 20 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and drizzle with fresh lemon juice before serving warm in a bowl.