Begin by laying the sliced eggplant on a rack fitted on top of a baking sheet and sprinkle kosher salt all over the top. Leave eggplant for 20-30 minutes so the salt can extra extra moisture.
Then use a paper towel and blot any excess moisture and salt off the eggplant slices.
In a shallow dish, combine the breadcrumbs, parmesan cheese, lemon zest and herbs and stir to combine.
In another bowl, whisk together eggs and milk.
Dip each eggplant slice into the egg mixture, allowing any excess to drip off and then coat in the breadcrumb mixture on all sides. Continue with the rest of the eggplant and set aside on a baking sheet.
Heat a large skillet with oil and bring to medium-high heat. Fry 3-4 eggplant slices at a time until golden brown, about 3-4 minutes then flip over and fry the other side for 2-3 minutes.
Once done, remove fried eggplant to rack or paper towel lined baking sheet and immediately sprinkle with salt.
Pre-heat oven to 400 degrees Fahrenheit and pour ½ the marinara sauce on the bottom of your baking dish. Then layer eggplant slices and another layer of marinara and finally top with sliced mozzarella and grated Parmesan cheese.
Cover baking dish with foil and bake for 20 minutes until cheese has melted. Then remove foil and continue baking for 10 minutes until cheese is bubbling and lightly golden.