Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Drain and rinse the chickpeas, then pat them very dry with a clean kitchen towel to ensure they crisp up during roasting.
Cut the chicken breast into bite-sized 1-inch cubes and chop the red bell pepper into similar sized pieces.
In a large mixing bowl, combine the chicken, dried chickpeas, broccoli florets, and bell peppers.
Drizzle the olive oil over the mixture and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and spices.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between the pieces for even roasting.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the chickpeas are golden brown.
Remove from the oven and immediately drizzle with fresh lemon juice to brighten the flavors before serving.