1. Microwave butter until just melted.
  2. Add sugar, molasses, baking soda, kosher salt, vanilla, and cornstarch. Whisk 30 seconds, rest 2 minutes, and repeat until thickened.
  3. Add egg and mix.
  4. Add flour and chocolate chips and mix until just combined.
  5. Optionally chill 2-72 hours.
  6. Bake at 350F for 10-15 minutes
  7. Optional but highly recommended: top with flakey sea salt, if the original cookie is not too salty

Basic cookie recipe.

Basic cookie recipe.

The Ultimate Average Chocolate Chip Cookie | Recipe

The science of cookies.