Combine the flour, baking soda, and salt in a small bowl and set aside.
In your stand mixer or medium-sized bowl, add the butter, brown sugar, and granulated sugar.
Mix until the butter-sugar mixture is fluffy and light.
Add in the egg and vanilla. Mix only until the mixture is combined, don't overmix.
Next, add in the flour mixture and mix to combine.
Last are the chocolate chips. Mix to combine then chill the batter for at least 2 hours- I prefer 6 hours to overnight personally.
Preheat the oven to 350 degrees. Line 2 baking sheets with parchment paper.
Scoop your cookies onto the baking sheet, giving them a few inches to spread.
Bake for 10-12 minutes until the edges are very lightly browned.
Remove from the oven and let them cool for a few minutes on the pan. Then, carefully remove them and place them on a cooling rack to finish cooling.
It is important to let these cool as they will fall apart if you don't!