To Prepare the Eggplant: Peel eggplant, leaving a few strips of peel intact around the circumference. Slice into 1/4-1/3 inch thick slices. Arrange the eggplant slices in a single layer on baking sheets lined with doubled paper towels. Sprinkle all over lightly with kosher salt.
Top with another sheet of paper towels, pressing down. Set aside to let the bitter juices weep from the eggplant, about 30-60 minutes. Once juices have released, use paper towels to rub gently removing kosher salt. (You can rinse and pat dry with paper towels as well.)
To Bread the Eggplant Set Up a Dredging Station:1st - Place the flour in a medium size shallow plate or bowl and whisk in 1/4 teaspoon salt. 2nd - In another medium size shallow bowl whisk the egg and milk together with 1/4 teaspoon salt. 3rd - In a large shallow bowl whisk together breadcrumbs, 1 teaspoon Italian seasoning, remaining 1 teaspoon salt and black pepper. Dredge each eggplant slice first in the flour, then dip in the egg, and finally dredge it into the breadcrumb mixture pressing to adhere. Have nearby a sheet pan brushed with vegetable or olive oil.
Transfer slices laying side by side in a single layer. Repeat with the remaining eggplant slices. Spray tops liberally with cooking spray or drizzle with additional oil.
Preheat oven to 400°F. Bake eggplant slices for 10 minutes then flip and bake for another 10 minutes. Remove from oven and set aside. (You can broil to brown further, if desired)
To Assemble: Spray a 13x9 inch baking dish with cooking spray. Spread 1 cup marinara sauce on bottom of dish. Cover the bottom of the baking dish with one layer of eggplant, then sprinkle with 1 cup mozzarella cheese, a sprinkling of grated Parmesan and Italian seasoning.
Drizzle cheese with around 2 cups sauce, then repeat layers. (The amount of layers can vary depending on the size of the eggplants used. Divide ingredients evenly between layers, regardless.)
For the last layer, drizzle eggplant with marinara before ending with mozzarella cheese, grated Parmesan and Italian seasoning.
Place eggplant into the oven and bake until hot and bubbly and the cheese is just beginning to brown, about 30 minutes.
Let stand for 5 minutes then cut and serve immediately garnished with fresh basil and additional Parmesan cheese, if desired.