Preheat oven to 180°.
Mash the banana then add in all other ingredients for the base.
Pour into a well greased or non stick baking dish.
Make the almond filling by adding the milk in very small amounts.
Place blobs of the almond filling on top of the oat mixture.
Use a knife to swirl the filling through the oats.
Add slivered almonds on top.
Bake for 25-35 minutes until slightly golden on top.
Remove from the oven and let cool for 10-15 minutes.
Dust with icing sugar, then cut into pieces and enjoy.
