In a large bowl, whisk the egg with sugar and vanilla extract until sugar dissolves.
Add melted butter, give your mixture a quick mix. Add all purpose flour and baking powder.
Combine all together until you have a soft elastic cookies dough, shape your dough as a large ball.
Cut the dough into two halves, place the half with the vanilla flavour into a bowl. And to the remain half add cacao powder, knead with hand until you have a chocolate cookies dough.
Shape cookies as small balls, place them simply in your baking tray.
With small spoon press to make a cavity at the middle of the balls, or decorate the small balls with a fork make a cross lines, i dip my cookies in a grated coconut or decorate the small balls with a fork make a cross lines, i also dipped my cookies in a grated coconut to gave me a coconut flavor.
Repeat the same with chocolate cookies.
Fill vanilla cookies with strawberry jam (the chocolate cookies will fill it after baking).
Bake at preheated oven 200°C for 7 minutes.
Fill the chocolate cookies with melted chocolate, let cookies cool before serve it.