Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the softened butter, white sugar, and brown sugar. Cream them together until light and fluffy (about 2-3 minutes).
Add the egg and vanilla extract to the creamed mixture. Mix until fully incorporated.
In a separate bowl, whisk together the all-purpose flour, baking soda, and salt.
Gradually add the dry mixture to the wet ingredients and mix until just combined.
Fold in the semi-sweet chocolate chips using a spatula.
Scoop rounded balls of dough onto a baking sheet lined with parchment paper, leaving space between each cookie.
Bake for 10-12 minutes, or until edges are golden brown. The centers should look slightly underbaked.
Let cookies cool on the baking sheet for about 5 minutes before transferring to a wire rack.
