Preheat the oven to 240 degrees Celsius (464 degrees Fahrenheit) celcius (fan oven).

Whisk eggs and sugar until white and airy.

Sift flour, cocoa, and baking powder into the egg mixture and fold it gently together until a homogeneous mass.

Line a springform pan with baking paper on the bottom.

Pour the batter into the springform pan and bake the cake base in the oven for 5 minutes.

Remove the springform pan from the oven and release the cake base from the side of the springform pan with a small knife. Then lift the cake base off the springform and let it cool on a wire rack.

When the cake base has cooled, it is ready to use.