Crack the eggs into a mixing bowl and whisk as you would for an omelet.

Add the granulated sugar, vanilla sugar, and milk. Mix well.

Soak the bread slices in the mixture so they absorb it thoroughly.

Melt butter in a skillet and brown the bread slices on both sides.

Place the cooked slices on paper towels to drain excess butter.

Transfer to a serving dish and sprinkle with granulated sugar.