1. In a bowl, mix the flour, sugar, baking powder and a pinch of salt.
2. Add the oil, vanilla and a little water. Mix until you get a kneadable consistency.
3. Add a little more water or flour, if necessary.
4. It forms thin cylinders with a mass of about 7 cm long.
5. Transfer them to a tray and bake for 15 minutes at 170ºC/340ºF.
6. Melt the chocolate and dip the bars.
7. Let them cool to room temperature, if necessary, take it to the refrigerator.