Preheat oven to 425 degrees.
Line two large baking sheets with parchment paper, or spray with avocado oil.
Arrange eggplant slices on the baking sheets.
Season eggplant with salt, and garlic (if using).
Spoon marinara sauce in the center of each eggplant slice.
Sprinkle cheese evenly, on top of the marinara sauce.
Bake the eggplant pizzas for about 20 minutes.
Remove from the oven and scatter the shredded basil on top.
Season with pepper to taste.
Serve immediately.