Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel and cut it into uniform bite-sized cubes.
Rinse and drain the chickpeas, then pat them thoroughly dry to ensure they become crunchy in the oven.
Place the chicken, chickpeas, broccoli florets, and chopped red bell pepper onto the prepared baking sheet.
Drizzle the olive oil over the ingredients and sprinkle evenly with garlic powder, smoked paprika, sea salt, and black pepper.
Toss everything together with your hands or tongs until well coated, then spread into a single layer.
Roast for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden.
Remove from the oven and drizzle fresh lemon juice over the entire tray before portioning into a bowl.