Cook bacon in a medium skillet over low heat until crisp. Remove bacon; reserve drippings in skillet. Crumble bacon; set aside. Sauté onion in drippings until tender.
Combine mashed eggplant, bacon, onion, egg, breadcrumbs, salt, and pepper; mix well. Spoon mixture into a greased 1-quart casserole. Bake, uncovered, at 350° for 1 hour.
Oxmoor House Homestyle Recipes