Preheat oven to 400 degrees. Spray a rimmed baking sheet with oil, or pour some oil on baking sheet. Season flour with salt and pepper. Dip eggplant slices in flour, then in egg, then in bread crumbs, pressing crumbs down with fingers if needed to cover evenly. Place in a single layer on oiled baking sheet. Bake in preheated oven for 10 minutes then carefully flip each slice and cook an additional 10 minutes, until nicely browned. Remove from oven and reduce oven temperature to 350 degrees.