Mix flour and cocoa powder, set to side

Separate yolks from white and add in sugar. Beat until creamy, then add in flour mixture

On a separate bowl, with clean beaters, beat eggwhites until stiff, fold into yolk mixture

Pour batter onto pan, bake on preheated 350 F for 25-35 mins depending your oven

Once cake is cooled to room temperature, slice into half

Warm jam in microwave for 30-45 seconds, then brush each half of the cake with jam

Melt chocolate chips in microwave, then stir in butter. Spread chocolate onto one pf the cake, let stand at room temperature until chocolate firm up

Meanwhile, mix a little heavy cream with cocoa powder in a bowl. Set to side

Pour water into gelatin, set to side

Mix the rest of the cream with icing sugar, beat until soft cream, then add in softened gelatin and cocoa powder mixture, keep mixing until creamy mousse achieved

Spread mousse on the other cake, chill for 2-3 h

Once ready to serve, cut the other cake into 9 squares and place squares on the other cake, slice and serve

Enjoy!