01 - Preheat oven to 400°F (200°C). Line two baking sheets with parchment paper and lightly oil or spray them.
02 - Place eggplant slices in a colander, sprinkle with kosher salt on both sides, and let sit for 20 minutes to draw out moisture. Pat slices dry with paper towels.
03 - Set up three shallow bowls: one with flour, another whisking together eggs and milk, and a third combining panko breadcrumbs, 1/2 cup Parmesan, dried oregano, garlic powder, and black pepper.
04 - Dredge each eggplant slice in flour, shake off excess, dip into egg mixture, then coat thoroughly with the panko mixture. Place coated slices on prepared baking sheets.
05 - Lightly spray or brush eggplant slices with olive oil. Bake for 20 minutes, flipping halfway through, until golden and crisp.
06 - Lower oven temperature to 375°F (190°C).
07 - Spread 1 cup marinara sauce in a 9x13-inch baking dish. Arrange half the baked eggplant slices over sauce. Top with half the remaining marinara, 1 cup mozzarella, and 1/4 cup Parmesan. Repeat layering with remaining eggplant, sauce, mozzarella, and Parmesan.
08 - Bake uncovered for 25 minutes, until cheese is bubbly and golden. Let rest for 10 minutes before serving.
09 - Sprinkle chopped fresh basil over the top before serving.