Preheat the oven to 375°F (190°C).
Slice the eggplants lengthwise into 1/4-inch thick slices.
Sprinkle salt on the slices and let them sit for 15 minutes to draw out moisture.
Rinse the eggplant slices and pat them dry with paper towels.
Brush both sides of the slices with olive oil.
Grill or roast the eggplant slices until tender, about 5-7 minutes per side.
In a bowl, mix ricotta, mozzarella, Parmesan, egg, basil, salt, and pepper.
Spread a layer of marinara sauce on the bottom of a baking dish.
Place a spoonful of the cheese mixture on each eggplant slice and roll them up.
Arrange the rollatini in the baking dish, seam side down, and top with remaining marinara sauce.
Bake for 25-30 minutes until bubbly and golden.