Melt together butter and cooking chocolate then remove from heat

Add in the sugar, egg and vanilla, stir to mix then add in flour, corn flour, baking powder and salt. Knead them until become a good mix then mix in the choc chip

Preheat oven to 190. Take a tablespoon of the dough and place on the well greased baking tray, arrange them with some spaces in between until done. Bake at 190 for 25-30 or until the colour turn dry

Let them completely cool for at least 1/2 hour bfor serving or having them