Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Pat the chicken breast dry and cut into 1-inch cubes. Rinse and drain the chickpeas, then pat them very dry with a clean kitchen towel.
Place the chicken, chickpeas, and broccoli florets on the baking sheet. Drizzle with olive oil and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper.
Toss everything together until evenly coated, then spread in a single layer to ensure even roasting.
Roast for 18-20 minutes, or until the chicken is cooked through and the chickpeas are slightly crispy.
While the chicken and vegetables roast, remove the tough stems from the kale and tear the leaves into bite-sized pieces.
During the last 3 minutes of roasting, add the kale to the baking sheet and toss gently to wilt.
Remove from the oven, drizzle with fresh lemon juice, and serve warm in a large bowl.