Cut the eggplant into sticks about 3 inches long and 1/2 inch wide, similar to thick French fries. Spread the sticks on a baking sheet lined with paper towels and sprinkle with salt. Let them sit for 15 minutes to draw out excess moisture, then pat dry thoroughly.
Set up a three-station breading line. Place the all-purpose flour in a shallow dish. In a second dish, beat together the eggs and water. In a third dish, combine the panko breadcrumbs, grated parmesan cheese, italian seasoning, garlic powder, and black pepper.
Dredge each eggplant stick in flour, shaking off the excess. Dip into the egg wash, then press firmly into the panko mixture, coating all sides evenly. Place the breaded fries on a plate or tray.
Preheat the air fryer to 400 degrees F. Arrange the eggplant fries in a single layer in the basket - do not crowd them. Spray the tops generously with nonstick cooking spray.
Air fry at 400 degrees F for 8 to 10 minutes, flipping the fries halfway through and spraying the other side with cooking spray. Cook until the coating is crispy and deep golden brown.
Serve the eggplant fries immediately with warm marinara sauce for dipping. These are best eaten right away to enjoy the contrast between the crunchy coating and the creamy eggplant inside.