Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Rinse the chickpeas thoroughly and pat them very dry with a clean kitchen towel to ensure they get crispy.
Cut the chicken breast into bite-sized cubes and place them on the baking sheet along with the chickpeas and broccoli florets.
Drizzle the olive oil over the mixture and sprinkle evenly with sea salt, black pepper, smoked paprika, and garlic powder.
Toss the ingredients directly on the pan until every piece is well-coated, then spread them out into a single layer.
Roast in the oven for 20 to 25 minutes, giving the pan a good shake halfway through, until the chicken is cooked through and the chickpeas are golden.
Remove from the oven, drizzle with fresh lemon juice, and garnish with chopped fresh parsley before serving warm.