To start you will want to sweat the eggplant. Use kosher salt when salting the eggplant. The coarse grains don't dissolve as readily as the fine grains of regular table salt, so any excess can be easily wiped away. To be time-efficient, use the 30 to 45 minutes during which the salted eggplant sits to prepare the breading, cheeses, and sauce.
2 medium eggplants cut into 1/4-inch-thick rounds
2 1/4 Tbs kosher salt
2 cups seasoned bread
1 1/2 cups grated Parmesan cheese
1 cup flour
2 tsp salt and ground pepper
4 large eggs
6 tablespoons vegetable oil
2 jars tomato sauce
2 cups whole milk mozzerella shredded or 8 ounces sliced
Fresh basil leaves torn, for garnish
1. FOR THE EGGPLANT: Toss eggplant slices and kosher salt in large bowl until combined; transfer salted eggplant to large colander set over bowl. Let stand until eggplant releases about 2 tablespoons liquid, 30 to 45 minutes. Arrange eggplant slices on triple layer paper towels; cover with another triple layer paper towels. Firmly press each slice to remove as much liquid as possible, then wipe off excess salt.
2. While eggplant is draining, adjust oven racks to upper- and lower-middle positions, place rimmed baking sheet on each rack, and heat oven to 425 degrees. Mix the bread crumbs with 1 cup Parmesan, 1/4 teaspoon salt and 1/2 teaspoon pepper; set aside.
3. Combine flour and 1 teaspoon pepper in large zipper-lock bag; shake to combine. Beat eggs in second pie plate. Place 8 to 10 eggplant slices in bag with flour; seal bag and shake to coat eggplant. Remove eggplant slices, shaking off excess flour, dip in eggs, let excess egg run off, then coat evenly with bread crumb mixture; set breaded slices on wire rack set over baking sheet. Repeat with remaining eggplant.
4. Remove preheated baking sheets from oven; add 3 tablespoons oil to each sheet, tilting to coat evenly with oil. Place half of breaded eggplant on each sheet in single layer; bake until eggplant is well browned and crisp, about 30 minutes, switching and rotating baking sheets after 10 minutes, and flipping eggplant slices with wide spatula after 20 minutes. Do not turn off oven.
TO ASSEMBLE: Spread 1 cup tomato sauce in bottom of 13 by 9-inch baking dish. Layer in half of eggplant slices, overlapping slices to fit; distribute 1 cup sauce over eggplant; sprinkle with half of mozzarella. Layer in remaining eggplant and dot with 1 cup sauce, leaving majority of eggplant exposed so it will remain crisp; sprinkle with 1/4 cup Parmesan and remaining mozzarella.
Bake until bubbling and cheese is browned, 13 to 15 minutes. Cool 10 minutes; scatter basil over top, and serve, passing remaining tomato sauce separately.