In grinder,add brown sugar and coarsely grind it & set aside.

In bowl,place sifter,add all-purpose flour and baking powder and sift together,mix well and set aside.

In mixer machine,add butter,caster sugar,grinded brown sugar and beat until well combined.

Add egg and beat again.
During mixing,gradually add dry ingredients and beat well.

Add chocolate chips and mix well with the help of the spatula.
Cover and rest it for 20-25 minutes in refrigerate or10 minutes in freezer. e help of the spatula.

Grease baking tray with oil,take a mixture and make a ball,place it over the baking tray and slightly press it and add chocolate chips.
Bake in preheated oven at 150 C for 20-25 minutes.