Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel and cut into bite-sized 1-inch cubes.
Rinse and drain the chickpeas, then pat them very dry with a clean towel to ensure they get crispy in the oven.
Place the chicken cubes, dried chickpeas, and chopped red bell pepper onto the prepared sheet pan.
Drizzle with olive oil and sprinkle evenly with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything thoroughly to coat and spread into a single layer, ensuring the ingredients are not crowded.
Roast for 15 minutes, then remove the pan from the oven and toss in the chopped kale.
Return the pan to the oven for another 3-5 minutes until the chicken is cooked through and the kale is slightly wilted and crisp at the edges.
Drizzle the fresh lemon juice over the entire pan before serving the mixture in a large bowl.