Heat up Debic Butter. Once melted, turn off the heat and set aside until it reaches room temperature. Separate the milk fat and milk solids. Use the milk fat for the sponge, which is called clarified butter.
Sieve cake flour, cocoa powder, and baking powder.
Mix eggs, egg yolks, sugar, and inverted sugar, stirring well until the temperature reaches 30°C to 35°C.
Add in the dry ingredients and clarified butter (30°C to 35°C), mix well and prepare to use.
Pipe into the mold or spread on the tray. Bake at 180°C for around 7 to 13 minutes, depending on the size.