Mash the bananas with a fork until smooth, or blend them briefly in a blender.
Add the oats, mixed spice and cinnamon, then mix well to combine.
Fold in the cranberry sauce, followed by the dried cranberries and pumpkin seeds.
Leave the mixture to rest for a few minutes so the oats can absorb some moisture.
Meanwhile, preheat the oven to 180°C and line a baking tray with parchment paper.
Using your hands, shape the mixture into small patties and place them on the prepared tray.
Bake for about 20 minutes, until lightly golden.
Transfer to a wire rack and allow to cool before serving.
Air-fryer option: These cookies can also be baked in an air fryer for about 15 minutes, until set and lightly golden.