Preheat the air fryer to 400F.
Combine the rosemary, garlic powder, kosher salt and pepper.
Toss the potatoes with 1 Tablespoon olive oil and half of the spice mixture until evenly coated.
Combine the chicken pieces with the remaining 1 Tablespoon olive oil and remaining spice mixture, tossing until evenly coated.
Place the chicken thighs in the basket of your air fryer.
Arrange the potatoes around the chicken pieces.
Air fry for 12 minutes.
Toss the potatoes and add the lemon wedges.
Air fry for an additional 13 minutes or until the chicken is cooked through and registers 165F on a meat thermometer.
Transfer the chicken, potatoes and lemon to a serving dish, pouring any juices over the chicken and potatoes.
Garnish with fresh rosemary, if desired.