Preheat your oven to 375°F (190°C).
Slice the eggplants into ¼ inch thick rounds. Sprinkle with salt and let sit for 10 minutes to draw out moisture. Pat dry.
Set up a breading station with gluten-free flour, beaten eggs, and gluten-free breadcrumbs mixed with grated Parmesan cheese.
Dredge each eggplant slice in flour, dip in eggs, then coat with breadcrumb mixture.
Heat oil in a frying pan over medium heat. Fry eggplant slices until golden brown on both sides. Drain on paper towels.
In a baking dish, spread a layer of marinara sauce. Layer fried eggplant slices, more marinara sauce, and shredded mozzarella cheese. Repeat layers, finishing with mozzarella on top.
Bake in preheated oven for 25-30 minutes, until cheese is bubbly and golden.
Let cool for a few minutes before serving.