Preheat the oven to 425°F (220°C) and place a large sheet pan inside to heat.
In a large bowl, combine chili powder, cumin, ½ teaspoon salt, garlic powder, smoked paprika, and black pepper.
Transfer 1 teaspoon of this spice mix to a separate bowl for later.
Add 1 tablespoon olive oil to the remaining spices and mix well.
Toss the chicken, onion, and bell peppers in the spice mixture until evenly coated.
Carefully remove the hot pan, lightly grease it, and spread the chicken mixture evenly.
Roast for 15 minutes.
Meanwhile, toss kale and black beans with the remaining olive oil and salt.
Remove the pan, stir the chicken and vegetables, then add the kale and beans on top.
Return to the oven and roast for another 5–7 minutes until the chicken is fully cooked.
Mix the reserved spices with yogurt, lime juice, and water to create the dressing.
Divide into bowls, drizzle with dressing, and serve your Sheet Pan Chicken Fajita Bowls.