Take egg in a bowl. Add in brown sugar and vanilla essence. Beat it well till it is all mixed up.

Now take dark chocolate pieces in a microwave safe bowl, add butter over it and melt it in microwave for 45 sec. You can melt it by placing this bowl over a pan of simmering water.

Once it is melted, remove it and let it cool a bit.

Now add the egg mix in and mix well.

Add in all purpose flour and baking powder. Mix well till it is combined.

Add in ½ cup of chocolate chips and ½ cup of chocolate chunks. Reserve few for topping the cookies..Mix this well.

Place this bowl in fridge for around 30 mins.

Now line a tray with silicon mat or foil and scoop some of the batter using a icecream scoop and place it over the tray. Leave distance between each cookie.

Now take the remaining chocolate chips and chunks and dot it all over the cookies.

Place this tray in freezer for 10 to 15 mins till the cookies get rock hard.

Preheat oven to 170 Degree C.

Now pop it straight into the oven and bake for 16 mins.

Remove it from oven and let it cool on the tray before removing it carefully using a spatula.

Enjoy it warm.