This simple recipe is very old and known by many names, most famously French toast, egg toast, or pain perdu, Often served as a sweet dish, I prefer mine simply seasoned with salt and pepper.
Beat three eggs in a cup of milk or half-and-half. Season with salt and pepper. Add a little vanilla if you plan to serve it sweet. Sop dried bread–I use a light wheat cut on the thick side–in egg/milk mixture, and pan-fry in butter until nicely browned.