Mix the oat flakes with the milk and leave to swell for 10 minutes. Combine all of the dry ingredients in a bowl. Put the egg in another bowl and stir. Then the sugar is added, the oil and finally the applesauce. Mix everything well with a whisk and then add the oat flakes and stir in. Then the dry ingredients are added, they are carefully folded in, just until everything is moist. The muffins are baked in a preheated oven at 180 ° for about 20-25 minutes.