Preheat the oven to 375°F (190°C).
Sprinkle salt on the eggplant slices and let them sit for 30 minutes.
Rinse and pat the eggplant slices dry.
Set up bowls with flour, beaten eggs, and breadcrumbs.
Dip each eggplant slice in flour, then eggs, and coat with breadcrumbs.
Fry the eggplant slices in oil until golden brown.
Spread marinara sauce in a baking dish.
Layer fried eggplant slices over the sauce, followed by more sauce and cheeses.
Repeat layers until all ingredients are used, finishing with cheese on top.
Bake for 25-30 minutes until bubbly and golden brown.