Line a large baking sheet with parchment or silicone baking mat. Set aside
In the bowl of an electric mixer, beat butter until smooth.
Add sugars and cream together. Add egg yolk, then vanilla. Beat until fully incorporated, and light and fluffy (30 seconds).
Add salt, then add flour, one cup at a time.
Add chocolate chips, and mix until just combined.
Pre-heat your oven to 350*F.
Form dough into two large balls. Put one ball of dough in a bag in the fridge, while you roll out and cut the other dough as desired. Use remaining dough from fridge once you have used the first ball of dough.