In a bowl, mix the flour with the cornflour, baking powder, crumbled pepernoten, the salt and the sugar well with a fork.
In a second bowl, mix the milk with the melted butter and the egg.
Add the wet mixture to the dry ingredients and stir well with a ladle until everything is wet. There may still be lumps in it, that doesn't matter.
Divide the batter between the 12 tins and put the baking tray in the oven.
Bake for 20 to 25 minutes (or until done. You can check that by putting a satay pricker inside of the muffin. If it comes out dry your muffin is done).
Remove from the oven and let cool for 5 minutes.
Remove the muffins from the mold and eat immediately or let them cool on a rack.