Preheat oven to 425°F, dice onion, drain chickpeas, chop kale, and toss chicken thighs with onion, chickpeas, and 2 tablespoons oil mixed with paprika, cumin, salt, and garlic powder on a sheet pan.
Roast for 12 minutes, then toss kale with remaining 1 tablespoon oil and push to edges of pan around chicken.
Roast for another 8 minutes until chicken reaches 165°F and kale is slightly crispy.
Divide among plates and serve hot.