Mix melted unsalted butter, white sugar, and brown sugar in a bowl until well combined.

Add the egg, salt, and vanilla extract, then mix until the mixture becomes pale and creamy.

Sift all-purpose flour and baking soda into the mixture, then gently fold with a spatula until just combined.

Add chocolate chips and mix evenly.

Scoop 1 tablespoon portions onto a baking tray, leaving space between each cookie.