Preheat oven to 180 degrees celsius approx 350 F.
Prepare a 12 cup muffin tin, grease it or line with paper cups.
Grate the apple. Soak the rolled oats and grated apple and vanilla in the milk for at least 20 minutes, or overnight.
Place the dry ingredients; flour, baking powder, cinnamon and brown sugar in a large mixing bowl, and combine them.
Add the apple sauce and oil to the soaked oats and mix well.
Add the wet ingredients to the dry ingredients and gently combine until just mixed.
Portion batter into the muffin tray.
Bake for 25-30 minutes. The muffins will be golden when cooked and will bounce back when gently pressed in the centre. Allow to cool in the tray for 5 minutes before removing.
