Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Drain and rinse the chickpeas, then roll them between two clean kitchen towels to remove all moisture for maximum crispiness.
Dice the chicken breast into 1-inch cubes and chop the red bell pepper and red onion into similar bite-sized pieces.
Place the chicken, dried chickpeas, peppers, and onions on the prepared baking sheet.
Drizzle the mixture with olive oil and sprinkle evenly with sea salt, black pepper, smoked paprika, and garlic powder.
Toss the ingredients with your hands or a spatula until every piece is well-coated, then spread them out into a single layer.
Roast for 20 to 22 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden and firm.
While the sheet pan is roasting, place the chopped kale in a large mixing bowl and drizzle with lemon juice.
Massage the kale with your hands for about 60 seconds until the leaves soften and turn a deep, vibrant green.
Assemble the bowl by placing the massaged kale at the base and topping it with the hot roasted chicken, chickpeas, and vegetables.