In a mixing bowl..mix melted butter and sugar for couple of minutes using a whisker or hand mixer

Add in eggs and beat again,add vanilla flavor and whisk

Add the dry ingredients flour,cocoa powder,salt and baking powder,whisk until well combined

Grease a baking pan with butter and dust with little flour,then pour in your batter and labelled if wit spatulate

Bake it in a preheated oven @350°F for 15-20mins

Insert a toothpick at the centre,if it comes out clean is done,then remove it from the oven and allow it to cool completely

Cut it into half,spread melted chocolate on one side and melted white chocolate on the other side.

Cut it like a pizza and add toppings of your choice !