Combine milk with vinegar to make soured milk and set aside for 10 minutes.
Sieve together flour, baking powder and baking soda. Add in sugar, vanilla sugar, salt and mix with a spoon.
Add the melted butter and the beaten egg to the soured milk.
Make a well in the centre of the dry ingredients and fill with the liquid mixture.
Stir just until MOST of the lumps have dissolved but DO NOT OVERMIX. Few lumps and traces of dry ingredients are GOOD!
Allow to rest for 10 minutes.
DO NOT stir!
Heat and butter a frying pan /skillet and place about 1/4 cups batter on it.
Use the back side of a spoon to spread the thick mixture towards the edges.
Cook until you see bubbles appearing on the top.
Carefully flip with a large spatula and cook further until golden brown.
Serve warm with butter, honey, lemon curd, maple syrup, powdered sugar-cinnamon blend or any preserve of your choice.