Beat eggs in a dish with a dash of salt and pepper. In another universe, this could be the beginning of a classic French toast, but here it sets the stage for something grander. Spread a liberal amount of mustard and mayo on each bread slice, then heap on the ham and Gruyere like you're building a culinary tower. Secure the layers with a friendly press—teamwork makes the dream work!

Heat your skillet, let the butter sizzle, and soak your sandwich masterpiece in the egg mixture. Now, let it fry to a golden hue, flipping once with the finesse of a seasoned chef. And voila! You've just made a sandwich that’s part brunch, part lunch, and entirely delicious.