Preheat your oven to 400°F and lightly grease a large baking sheet with the olive oil.
Slice the eggplant into 1/2-inch thick rounds and sprinkle both sides with sea salt; let sit for 10 minutes to draw out moisture, then pat dry with a paper towel.
In a shallow dish, whisk the egg whites until they become slightly frothy.
In a separate shallow dish, combine the panko breadcrumbs, almond flour, parmesan cheese, garlic powder, and black pepper.
Dip each eggplant slice into the egg whites, then press firmly into the breading mixture until evenly coated on both sides.
Arrange the eggplant slices on the prepared baking sheet and bake for 20 minutes, flipping halfway through, until the exterior is golden and crispy.
While the eggplant bakes, stir together the low-fat ricotta cheese and dried oregano in a small bowl.
Remove the eggplant from the oven and top each slice with a dollop of the ricotta mixture, a spoonful of marinara sauce, and a sprinkle of mozzarella cheese.
Return the tray to the oven for 5-7 minutes, or until the cheese is melted and bubbly.