Beat the eggs with the sugar. Add the flour sifted with the baking powder. Pour the mixture into a square baking dish, covered with baking paper and greased with the oil.
Spread it evenly throughout the dish. Bake in a preheated 374°F (190 °C) oven until slightly pink.
Take it out of the oven and while still warm, invert it onto a wet cloth. Remove the baking paper.