In the bowl of the stand up mixer, using the flat beater cream the butter and sugar (approximately 2-3 minutes), add the egg and vanilla and beat until combined.
In a medium bowl whisk together flour, baking soda and salt, then whisk in the chocolate chips.
To the creamed mixture add 1/3 at a time the flour mixture, beating on low just until combined. Turn onto a lightly floured flat surface, knead gently a few times until combined form into a ball and wrap in plastic wrap. Chill in the fridge for 1-24 hours.
Remove the dough from the fridge, shape into large golf ball sized balls and place on parchment paper lined cookie sheets, flatten with a fork (dip the fork lightly in flour, so it doesn't stick to the cookie dough). Add a few more chocolate chips if desired and refrigerate while the oven is pre-heating.
Pre-heat oven to 350°F (180C).
Remove the cookies from the fridge and bake for approximately 15 minutes. Let cool completely before serving. Enjoy!
Please note the it is baking soda not baking powder (as shown in video).