Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Rinse the chickpeas and pat them very dry with a paper towel to ensure they roast up crispy.
Cut the chicken breast and red bell pepper into uniform 1-inch bite-sized pieces.
Place the chicken, chickpeas, broccoli florets, and bell peppers onto the prepared baking sheet.
Drizzle the olive oil over the ingredients and sprinkle evenly with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything with your hands or a spatula until well-coated, then spread into a single even layer.
Roast for 20-25 minutes, giving the pan a good shake halfway through, until the chicken is cooked through and the chickpeas are golden.
Remove from the oven and drizzle with fresh lemon juice before serving warm.