Preheat the oven to 180°C convection oven.
Line a rectangular baking tin (approx. 32cmx24cm) with baking paper.
Cream the soft butter with the agave syrup and maple syrup and add the eggs.
Mix the Bircher muesli with flour and baking powder.
Quarter, core and roughly grate an apple (preferably with skin). Mix with lemon juice and apple puree.
Quarter and core the second apple. Cut into 12 approx. 2-3mm thin slices and set aside.
Mix all the ingredients (except the apple slices) together.
Pour the dough into the prepared baking dish.
Spread the 12 apple slices on the dough so that there is an apple slice on each bar after baking and cutting.
Bake for approx. 30 min.
Remove from the oven and cut into 12 pieces while still hot.
Leave to cool. And then enjoy!