Place the eggs, sugar, and oil in a bowl and mix well. In another bowl, combine the baking powder, vanilla, cocoa, and flour, and mix them well. Then, add the flour mixture to the egg mixture and mix thoroughly.

Pour the batter into a mold and bake in the oven for at least 45 minutes until done.

Remove the mold from the oven and let it cool slightly. If desired, place it in the refrigerator, as cocoa cake is served cold.