Preheat the oven to 425° F (220° C). Grease a cast iron skillet with sunflower oil.
Place all ingredients in a food processor or blender and process until you have a smooth batter.
Pour mixture into the greased pan. Bake for 15 minutes and remove from oven. Using a spatula, flip the flatbread over and bake for another 15 minutes.
The flatbread is done when the sides start to pull away from the pan. It may require an additional 5 minutes of baking. Remove from oven, cool, cut, and serve!