01 - Preheat oven to 400 degrees Fahrenheit. Line two baking sheets with parchment paper and lightly oil or spray.
02 - Arrange eggplant slices in a colander, sprinkle both sides with kosher salt, and let rest for 20 minutes to draw out excess moisture. Pat dry with paper towels.
03 - Place flour in one shallow bowl. In a separate bowl, whisk eggs and milk. In a third bowl, combine panko, Parmesan, oregano, garlic powder, and black pepper.
04 - Dredge each eggplant slice in flour, shaking off excess, then dip into egg mixture, and thoroughly coat with panko mixture. Arrange coated slices on prepared baking sheets.
05 - Lightly spray or brush eggplant slices with olive oil. Bake for 20 minutes, turning halfway through, until golden and crisp.
06 - Reduce oven heat to 375 degrees Fahrenheit.
07 - Spread 1 cup marinara sauce evenly in a 9x13-inch baking dish. Arrange half of the baked eggplant slices on the sauce. Top with half of the remaining marinara, 1 cup mozzarella, and 1/4 cup Parmesan cheese. Repeat layers with remaining eggplant, sauce, mozzarella, and Parmesan.
08 - Bake uncovered for 25 minutes until cheese is bubbly and golden. Allow to cool for 10 minutes before serving.
09 - Sprinkle chopped fresh basil over the top just before serving.