Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.
In a large bowl, cream together the butter, brown sugar, and granulated sugar until fluffy—like, don’t be shy, give it a good mix.
Beat in the eggs one at a time, then add the vanilla.
In another bowl, whisk the flour, baking soda, salt, and cornstarch together.
Gradually add the dry ingredients to the wet, mixing just until combined.
Fold in the chocolate chips. Sneak a few. It’s tradition.
Scoop tablespoon-sized balls onto your baking sheets—leave space, these guys spread.
Bake for 8–10 minutes. The edges should be set, but the centers will look soft (that’s the trick!).
Let them cool on the tray for a few minutes before moving them. Or eat them warm and gooey. I won’t judge.