Whisk together the milk, eggs, flour and salt.
Melt the butter in a pan and pour in the batter to the thickness of a finger.
Spread blueberries on top, sprinkle with sugar and cinnamon.
Bake in the oven at 220 °C for about 5 to 10 minutes, but preferably on sight until golden brown.
Remove and sprinkle with powdered sugar.