6. Make the Cookie Dough
Combine the butter, granulated sugar, and brown sugar in the bowl of a stand mixer fitted with the paddle attachment. Beat on medium-high speed until light and fluffy, 2 minutes. Scrape down the sides and bottom of the bowl.
With the mixer on medium-high, add the egg and vanilla. Beat until combined and smooth. Scrape down the sides and bottom of the bowl.
Add the flour and salt, and beat on low speed just until combined. Remove the bowl from the mixer and fold in the chocolate chips.