Bring the milk with water, Cake butter, salt and sugar to the boil.
Add the flour and stir thoroughly until the dough separates from the saucepan.
Using a spatula, transfer the dough to the bowl of a food processor.
Add the eggs one by one, until you get a smooth and homogeneous batter.
Pipe the dough onto a baking sheet with a baking mat.
Place the craquelin on the piped dough.
Place in a 180°C oven.
Immediately lower the temperature to 160°C and bake for 40 minutes.