Preheat oven to 320°F (160°C). Grease and dust 8” pan with a little maida flour. Blend macadamias into a meal if need be. Whisk together flour, nut meal and baking powder. Set aside. Slice vanilla pods lengthwise and scrape out the seeds. Place cashew yogurt, oil, corn syrup, mirin, sugar, egg replacer, and vanilla seeds into a blender. Blend until smooth. Pour onto dry ingredients and mix well. Add water if the batter is too stiff to mix. Batter will be thick. Bake 35min or until brown and sides pull away.