Ingredients (for 4 buns)
4 hamburger buns or soft buns of your choice

100 g of ham (cooked or raw as desired)

1 small cucumber (optional, preferably pickled)

1 tomato

100 g of cheese (Emmental, mozzarella, cheddar, to taste)

2 eggs

Salt and pepper to taste

1 tablespoon mayonnaise or crème fraîche

A little ketchup

Extra grated cheese for gratin (optional)

Method
Prepare the vegetables
Wash and slice the tomato and cucumber into thin slices.

Beat the eggs
In a bowl, beat the eggs with salt, pepper, and mayonnaise (or crème fraîche) until smooth.

Prepare the sandwiches
Cut the sandwiches in half (without going all the way through) and spread a thin layer of ketchup on the inside.

Filling:
Fill each bun with the ham slices, tomato, cucumber, and sliced ​​cheese, and pour a little of the egg mixture into each bun.
If desired, sprinkle grated cheese on top for a cheesy, gratinated effect.

Baking:
Place the rolls on a baking sheet lined with parchment paper. Bake in a preheated oven at 180°C (350°F) for about 15 minutes.
If you want an even golden brown surface, grill for another 2-3 minutes.