Preheat oven to 425°F (220°C) and line two large baking sheets with parchment paper.
Set up a dredging station: place beaten eggs in one shallow bowl and combine Panko, Parmesan, oregano, garlic powder, salt, and pepper in a second shallow bowl.
Dip each eggplant slice into the egg wash, allowing excess to drip off, then press firmly into the Panko mixture to coat both sides evenly.
Arrange coated eggplant slices in a single layer on the baking sheets and bake for 20 minutes, flipping halfway through, until the exterior is golden brown and crispy.
Spread 0.5 cups of marinara sauce across the bottom of a 9x13 inch oven-safe baking dish.
Arrange half of the baked eggplant slices in the dish, top with half of the remaining marinara sauce, and sprinkle with half of the mozzarella cheese.
Repeat the layering process with the remaining eggplant, sauce, and mozzarella.
Bake the assembled dish for 15 minutes or until the cheese is fully melted and internal temperature reaches 165°F.
Remove from oven and let rest for 5 minutes; garnish with fresh basil before serving.