Steps
1. Heat olive oil in a pan over medium heat.
2. Add the thinly sliced potatoes and cook until crispy and golden brown. Season with salt and pepper.
3. In a separate pan, scramble the egg until cooked through.
4. Toast the bread slices until golden brown.
5. Assemble the sandwich by layering the crispy potatoes, scrambled egg, cucumber slices, and ketchup between the bread slices.
6. Cut the sandwich in half and serve.