1 cup tomato sauce (pizza, marinara, whatever you like)
1 cup shredded or sliced mozzarella cheese (can sub provolone or other cheese)
toppings: fresh spinach, pepperoni, green pepper, Canadian bacon, etc.
Preheat oven to 350 degrees. Press each slice of eggplant with paper towels to remove a little of the excess moisture. Put egg whites and bread crumbs in separate shallow bowls. Dip eggplant slices in egg whites, then coat with breadcrumbs. Put on a baking sheet and drizzle with a tiny bit of olive oil.
Bake for 10 minutes or until crisp on one side. Turn each piece over, drizzle with a tiny bit of olive oil, and bake another 5-8 minutes.
Top each slice with a little tomato sauce, cheese, and your toppings. Bake another 5-10 minutes until cheese is melted.
I found that it worked best to layer the toppings on top of the sauce and underneath the cheese.
Recipe by Pinch of Yum at http://pinchofyum.com/cheesy-baked-eggplant-pizza