Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Pat the chicken breast dry and cut into 1-inch bite-sized pieces, then rinse and thoroughly dry the chickpeas to ensure they roast properly.
Place the chicken, chickpeas, diced bell peppers, and sliced red onions onto the prepared baking sheet.
Drizzle the mixture with olive oil and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper, tossing well to coat every piece.
Roast in the oven for 18-20 minutes, or until the chicken is cooked through and the chickpeas are golden and slightly crunchy.
While the sheet pan is roasting, place the chopped kale in a large bowl and drizzle with lemon juice, massaging the leaves for 1 minute until they soften.
Remove the baking sheet from the oven and transfer the warm chicken and veggie mixture into the bowl with the kale, tossing gently to combine before serving.