Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Pat the chicken breast and chickpeas completely dry with a paper towel to ensure they roast properly rather than steam.
Dice the chicken into 1-inch bite-sized pieces and slice the red bell pepper into thin strips.
Place the chicken, chickpeas, broccoli florets, and bell peppers onto the prepared baking sheet.
Drizzle the olive oil over the mixture and sprinkle evenly with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything together with your hands or a spatula until every piece is well-coated in oil and spices.
Spread the ingredients out into a single layer, ensuring they aren't overcrowded to achieve maximum crispiness.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the chickpeas are golden.
Remove from the oven and drizzle the fresh lemon juice over the bowl before serving warm.