Preheat the oven at 180°C.
Mix the milk with the butter and the egg.
In a separate bowl, combine the flour with the sugar and the salt.
Mix the 2 preparations until dough starts to appear. Add the blueberries and mix again.
Fill ¾ of the Airbake muffins mold. Put it in the oven for 35 to 40 minutes until the muffins start to brown.