Add all brown sugar into soften butter. Whisk the butter to cream and light status.
Add white sugar, whisk evenly, not too much
Add egg to the butter cream, whisk them evenly
Add the vanilla extra to butter cream and whisk evenly
Mix flour with baking soda, baking powder and salt
Add flour to butter cream, 1/3 per time. Whisk low speed and mix them but avoid over beating
Add chocolate chips to the batter and mix them lightly.
Preheat the oven to bake 350F,make a batter ball and place them on the baking sheet covered by parchment paper and then bake for around 12 -14min until the edge just start to turn golden brown.