Surprise sandwiches filled with eggs

Instructions

1. Remove the sandwiches' tops, cutting them with a serrated knife, and empty the breadcrumbs. Brush the insides of the sandwiches and the cover with melted butter, season with salt, and stuff with your favorite ingredients: cooked ham, raw or speck, bacon, soft or seasoned cheese, leftover cooked vegetables like spinach, asparagus tips, artichokes, aubergines, and diced boiled potatoes.
2. Place an egg in the center of each sandwich and season with salt and pepper. Place the sandwiches on a baking sheet lined with parchment paper and reposition the caps with the cut side facing up.
3. Bake the sandwiches for 10 minutes at 180° in a preheated oven, then cover with a sheet of parchment paper and cook for another 10 minutes. Serve the sandwiches with the crispy caps and a teaspoon on the side.