Blend the apple sauce, banana, chia seeds and vanilla essence together.
In a mixing bowl put the dry ingredients, oats, flour, cinnamon and baking powder. Combine these together by whisking them.
Add the blended wet ingredients and melted butter to the dry ingredients, stir to combine. The dough will be quite wet at this stage. Refrigerate the cookie dough for 10-20 mins. This chilling time gives the chia seeds time to gel and the butter time to cool and harden making the dough easier to work with.
Preheat your oven to 180 degrees Celsius (360 Fahrenheit)
Scoop the cookie dough into balls, place them on a baking paper-lined tray, and flatten gently with the back of a spoon.
Bake for 10 minutes until lightly golden. Cool on a wire racks.