Preheat the oven to 180c/350f.
Add the oat flour, banana, soy milk & baking powder to a blender and mix until smooth (~ 10 seconds), or mash the banana and stir all the ingredients together.
Pour out into a lined baking tray/sheet & evenly spread (ours is 20x30cm).
Add toppings of choice.
Cook for 20 minutes or until lightly brown, then cut and serve.