Mix flour, starch, milk powder in a bowl

Melt butter in microwave

Using all in one method, beat eggs, sugar, emulsifier and essence to combine well

Beat in dry ingredients, mix until thickened

Fold in melted butter, until completely combined

Divide to 3 portions, adding cocoa powder and chocolate paste to 1

Pour batter into parchment lined mold

Bake on preheated 350 F for 25 mins

Cool cake before stacking each layer with jam

Leave cake either at room temperature or in the fridge for 4-6 hours or overnight, before slicing and serving