Slice the potato thinly and mix with 1 tbsp potato starch and a pinch of salt.

Heat a pan with oil and place the potato slices evenly.

Shape the potatoes into a round form using a spatula and cook until crispy on both sides.

Crack eggs into a bowl, add milk, salt, sugar, and pepper, and whisk together. Dip the bread into the egg mixture on both sides.

Heat a pan and cook the bread on both sides until golden brown.

Boil water, add 3 tbsp vinegar, and carefully poach the egg until desired doneness.