Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper.
Pat the chicken breast dry with paper towels and cut into 1-inch bite-sized cubes.
Rinse and drain the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure maximum crispiness.
Place the chicken cubes, chickpeas, broccoli florets, and sliced bell peppers onto the prepared sheet pan.
Drizzle the olive oil over the ingredients and sprinkle evenly with smoked paprika, ground cumin, sea salt, and black pepper.
Toss everything together with your hands or tongs until the chicken and vegetables are well-coated, then spread them out into a single layer.
Roast in the center of the oven for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden.
Remove the pan from the oven and immediately drizzle the fresh lemon juice over the hot ingredients.
Transfer to a bowl and garnish with finely chopped fresh parsley before serving.