In a large skillet, heat oil over medium-high heat. Add celery and onion; cook and stir until tender, 4-5 minutes. Remove from the heat. In a large bowl, combine bread and seasonings. Add celery mixture and broth; toss to coat. Set aside.
Cut a pocket in each pork chop by making a horizontal slice almost to the bone. Fill chops with bread mixture; secure with toothpicks if necessary.
Preheat air-fryer to 325°. Sprinkle chops with salt and pepper. Arrange in single layer on greased tray in air-fryer basket. Cook 10 minutes. Turn and cook until a thermometer inserted into center of stuffing reads 165° and thermometer inserted in pork reads at least 145°, 6-8 minutes longer. Let stand 5 minutes; discard toothpicks before serving.
Test Kitchen tip
If you don’t have an air fryer, you can make this recipe in an oven.