Mix in a bowl flour and baking powder.
Add potatoes mashed with a fork or potato masher.
Then add olive oil, egg, and salt.
Crack the egg with a metal spoon and mix for two minutes.
Transfer the mixture to a clean, well-floured work surface and knead for a few minutes.
Let rest in a covered bowl, out of the refrigerator, for 15 minutes.
Dust a cutting board with flour and roll out the dough thinly, using a rolling pin, to a height of about 3 mm.
Preheat the oven to 190 degrees (374F).
With a pasta cutter wheel or a knife, form squares 6 cm on a side. Remember two things about this dough: it is very elastic, and if it sticks a little to the cutting board, use a spatula.
Take the tip of a square and fold it inside, creating a roll shaped like a crescent moon.
Arrange the chifel on a baking sheet covered with parchment paper that you should not grease or wet.
Mix water, olive oil, and dried oregano in a glass. Then brush the surface of the chifel with the mixture.
Bake in preheated oven for 10 minutes or until the edges are golden brown.
Serve the chifel warm.