Preheat your oven to 350°F (175°C). Line a baking tray with parchment paper.
Mash the banana: In a large bowl, mash your ripe banana thoroughly until smooth with no lumps.
Combine ingredients: Add almond flour, baking powder (if using), and mix until a thick dough forms.
Fold in chocolate chips and dried cranberries (if using).
Shape the cookies: Scoop tablespoon-sized portions onto the lined tray. Flatten gently with your hand or a spoon — these cookies won't spread on their own.
Bake for 12–15 minutes, or until the edges turn lightly golden.
Cool for 5 minutes before serving. Enjoy warm or store for later!