Heat the oven to 425°F and line two baking sheets with parchment.
Beat the eggs in a shallow dish. In a second dish, mix the panko, 1/4 cup Parmesan, Italian seasoning and salt.
Dip each eggplant round in the egg, then press both sides into the panko mixture. Arrange in a single layer on the sheets and drizzle with olive oil.
Bake 20 minutes, flipping once halfway, until golden and crisp.
Reduce the oven to 400°F. Spread 1 cup marinara in a 9x13-inch baking dish. Layer half the eggplant, half the remaining sauce, half the mozzarella and the remaining Parmesan. Repeat with the remaining eggplant, sauce and mozzarella.
Bake 15-18 minutes until the sauce bubbles and the cheese is melted. Broil 1-2 minutes for extra browning, if you like.
Rest 5 minutes, scatter with basil and serve.