Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Dice the chicken breast into uniform 1-inch pieces to ensure even cooking throughout the tray.
In a large mixing bowl, combine the diced chicken, rinsed chickpeas, broccoli florets, and chopped red bell pepper.
Drizzle the olive oil over the mixture and sprinkle with the sea salt, black pepper, garlic powder, and smoked paprika.
Toss the ingredients thoroughly until every piece is well-coated in the aromatic spice blend.
Spread the mixture in a single layer on the prepared baking sheet, making sure not to overcrowd the pan so the vegetables can roast properly.
Roast for 18 to 22 minutes until the chicken is fully cooked and the broccoli has developed charred, crispy edges.
Remove from the oven and finish with a fresh squeeze of lemon juice before serving in a large bowl.