Preheat oven to 325 degrees Fahrenheit.

In a large bowl, beat melted butter, brown sugar, and granulated sugar until well combined and fluffy.

Add egg, egg yolk, and vanilla extract to the mixture and beat until smooth.

In a separate bowl, whisk together flour, baking soda, and salt.

Gradually add dry ingredients to wet mixture, mixing just until combined.

Fold in chocolate chips.

Using a cookie scoop, portion dough onto a baking sheet lined with parchment paper, about 2 inches apart.

Bake for 10 minutes or until edges are golden brown.

Let cookies cool on baking sheet for 5 minutes, then transfer to a wire rack to cool completely.