Preheat your oven to 350°F (175°C).
In a large bowl, mix the melted butter, granulated sugar, and brown sugar until smooth.
Add the egg and vanilla extract, mixing until well combined.
Sift in the flour, baking soda, and salt. Stir until just combined.
Fold in the chocolate chips.
Scoop the dough onto a baking sheet lined with parchment paper, spacing cookies 2 inches apart.