Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the chicken breast into 1-inch pieces and place them in a large mixing bowl.
Add the broccoli florets, sliced red bell pepper, and drained chickpeas to the bowl with the chicken.
In a small jar or bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, oregano, sea salt, and black pepper.
Pour the lemon-herb dressing over the chicken and vegetable mixture, tossing thoroughly to ensure every piece is well-coated.
Spread the mixture in a single, even layer onto the prepared baking sheet, ensuring nothing is overcrowded to allow for proper roasting.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.