Mash the bananas in a mixing bowl using a fork. Add the cocoa powder, vanilla, ginger and cinnamon.
Add the oats and combine well. Let the mixture rest for about ten minutes.
Meanwhile, set the oven to 180°C. Line a baking tray with parchment paper.
Add the chocolate chips and dried cranberries to the mixture. It should be sticky but not too thick.
Using your hands, shape the mixture into small, equal sized balls, then press them between your palms into cookies. Place them on the baking tray and bake in the oven for about 15 minutes until golden.
Let them cool on a wire-rack, then enjoy!