Remove the stems from the strawberries and cut them in half lengthwise.

Roll out the sandwich bread slices with a rolling pin until slightly larger.

In a bowl, mix the eggs, sugar, flour, and milk to create the egg mixture.

Grease a heatproof dish with butter and line it with the bread, allowing the edges to slightly overhang.

Place the strawberries on the bread and spoon mascarpone cheese into the gaps between the strawberries. Pour the egg mixture over the top.