Put all ingredients (A1) into a bowl and beat on medium speed for 3 minutes.
Add ingredient (A2) and beat on low speed for 1 minute until even. Pour cake batter (650g) into the baking tray 12”x 12”.
Bake at 200°C for 15 minutes.
Hand whisk all ingredients (B1) evenly.
Add in ingredient (B2) and mix well.
Add in ingredient (B3) and mix well.
Divide the cake into two equal parts. Spread chocolate cream filling on the surface of the first portion of the cake. Stack the 2nd portion of the cake on top and spread the remaining chocolate cream filling. Garnish and cut cake according to preference before serving.