For the dough, peel the bananas and mash them using a fork.
Mix the mashed bananas with the apple sauce.
Combine the dry ingredients for the dough (all the remaining ingredients), then add the mashed bananas with the apple sauce.
Line a baking sheet with parchment paper.
Form 16 cookies using slightly wet hands. Place the cookies on the parchment paper. As the cookies won’t rise, one large sheet should suffice (if you place the cookies close to each other).
Bake in the oven for about 20 minutes, until the cookies turn golden brown at the edges.
Once done, take them out of the oven and leave to cool completely.
For the frosting, combine all ingredients.
Drop a teaspoon of the frosting on the center of each cookie. Spread the frosting to the edges using the back of the teaspoon.
Leave to firm uncovered overnight at room temperature.
You can store the cookies for up to 5 days uncovered at room temperature. I recommend not to store them in an airtight container as the frosting will soften and get sticky.