Cut the potatoes into thin slices (slice best) and fry them until golden brown. Fry the onions and garlic for a few minutes until translucent, then set aside with the potatoes.
Mix the chickpea flour together with water, vinegar and baking powder vigorously until a creamy mixture is formed, then add the paprika powder, parsley and salt.
Mix this mixture with the potatoes, onions and garlic in a bowl and then place in a pan with hot sunflower oil, smoothing the surface. Cover and fry on both sides over medium heat for ten minutes.
Tip: To turn the tortilla, it is best to flip it from the pan onto a plate and then slide it back into the pan, you may have to add more oil.