Preheat oven to 400°F and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized 1-inch cubes and pat them dry with a paper towel.
Drain and rinse the chickpeas, then pat them very dry to ensure they get crispy in the oven.
Chop the broccoli into small florets and dice the red bell pepper into 1-inch pieces.
Place chicken, chickpeas, broccoli, and peppers on the prepared baking sheet.
Drizzle with olive oil and sprinkle with cumin, smoked paprika, garlic powder, sea salt, and black pepper.
Toss everything together until evenly coated and spread into a single layer.
Roast for 20 to 25 minutes, or until the chicken is cooked through and the chickpeas are slightly golden.
Remove from the oven and drizzle fresh lemon juice over the entire tray before serving.