In a large bowl, whisk together egg and water.
To this bowl, add ground beef, Stove Top stuffing, ¼ cup ketchup, seasoning salt, garlic powder, onion powder, and pepper. Combine with your hands just until mixed.
Shape the meat into 2 loaves and place them in the air fryer.
Air Fry at 350°F for 15 minutes. If the loaves are getting too brown, place foil over the tops of them then continue cooking for 10 more minutes.
While the meatloaves are cooking, prepare the glaze. In a small bowl, stir together the remaining ½ cup of ketchup and brown sugar.
After 25 minutes, open the air fryer and brush the glaze onto the tops and sides of the meatloaves.
Continue air frying at 350°F for another 10 minutes.
Check for doneness and measure the internal temperature. If the thermometer does not reach 160°F, continue to cook the meatloaves at 5-minute intervals.
When the meatloaves are done, allow them to rest in the basket for at least 5 minutes before slicing and serving.