Preheat the oven to 160°C fan-forced. Grease and line a regular loaf tin with baking paper.
Combine the oil, maple syrup, eggs and vanilla in a large bowl and beat with a fork until the eggs are incorporated.
Sift in the almond meal, oat flour, GF flour, baking powder and cinnamon, and fold through the mixture until combined.
Add in the apples and stir until they are coated with batter.
Pour the batter into the loaf pan and smooth flat.
Bake in the preheated oven for around 1 hour, or until cooked through and golden on top.
Remove from oven and allow to cool for 10-15 minutes, before turning on to a cooling rack. My family enjoys this cake best whilst warm, but it is delicious served either way.