Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Peel and dice the sweet potato into half-inch cubes and drain and rinse the chickpeas.
Cut the chicken breast into bite-sized pieces.
In a large bowl, toss the sweet potato cubes, chickpeas, and chicken with the olive oil, sea salt, black pepper, and garlic powder until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet.
Roast for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the sweet potatoes are fork-tender.
Place the baby kale in a serving bowl and top with the warm roasted chicken, sweet potato, and chickpea mixture.
Garnish with crumbled feta cheese and a fresh squeeze of lemon juice before serving.