Put the eggs, sugar and salt in a bowl and stir well. Stir in the oil and milk. Mix the flour, oat flakes, baking powder and cinnamon and stir in as well.
Wash the apples, cut into small pieces and fold in. Fill the dough into small paper cases and bake in the preheated oven at 180 ° C (gas level 3, fan 160 ° C) for about 25 minutes. After baking, let the muffins cool down and then dust them with powdered sugar.