Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Pat the chicken breast dry with paper towels and cut it into uniform 1-inch cubes.
Rinse and drain the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure maximum crispiness.
Dice the bell pepper and slice the zucchini into half-moons.
Place the chicken, chickpeas, bell pepper, and zucchini 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 until well coated and spread into a single, even layer.
Roast for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden and slightly crunchy.
Transfer the roasted mixture to a serving bowl and top with the sliced avocado.
Finish with a squeeze of fresh lemon juice and a sprinkle of chopped parsley.