Preheat oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Pat the chicken breast dry and cut into 1-inch bite-sized pieces.
Thoroughly dry the chickpeas with a clean kitchen towel to ensure they get crispy during roasting.
Place the chicken, chickpeas, sliced bell peppers, and red onions on the prepared baking sheet.
Drizzle with olive oil and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper.
Toss everything together until evenly coated, then spread into a single layer to ensure even cooking.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and chickpeas are golden.
Remove from the oven, drizzle with fresh lemon juice, and garnish with chopped parsley before serving.