Mix all of the ingredients in a bowl.
Mix the linseed with water, leave to absorb for approx. 10 mins. In a bowl, mix the rolled oats with all of the other ingredients up to and including the cinnamon. Add the bananas, maple syrup, coconut oil, vanilla paste and linseed, mix to create a batter. Transfer half of the ingredients to the prepared tin, smooth down. Arrange the apples on top, cover with the remainder of the cake mixture, smooth down, drizzle with maple syrup.
Approx. 30 mins. in the lower third of an oven preheated to 180 °C (convection). Remove from the oven, leave to cool on a cooling rack.