Lay out the sliced eggplants on a baking sheet and sprinkle generously with salt to draw out moisture; let sit for 20 minutes. Then, rinse off the excess salt and pat slices dry with a clean towel.
Preheat your oven to 400°F (200°C) and brush the eggplant slices lightly with olive oil, arranging them on a baking sheet lined with parchment paper.
Sprinkle the bread crumbs evenly over each slice, gently pressing them onto the surface to adhere.
Bake the eggplant slices for about 25-30 minutes until they are golden brown and tender, with crispy edges.
Meanwhile, heat a tablespoon of olive oil in a skillet over medium heat and sauté the minced garlic until fragrant, about 1 minute.
Add the marinara sauce to the skillet and stir in salt, pepper, and chopped basil. Let the sauce simmer gently for 10 minutes to develop flavor.
Once the eggplant slices are ready, assemble the dish in a baking dish by layering the baked slices with spoonfuls of sauce and sprinkling grated mozzarella and Parmesan cheese between layers.
Pour any remaining marinara sauce over the top layer and sprinkle generously with cheese, then bake the assembled dish for another 15 minutes until bubbly and golden on top.
Garnish with fresh basil leaves and let sit for 5 minutes to set before serving, allowing the flavors to meld.