Preheat the oven to 175°C (350°F). Line a baking sheet with parchment paper.

In a small bowl, whisk together flour, baking soda, and salt. Set aside.

In a larger bowl, beat softened butter, brown sugar, and granulated sugar until creamy. Add the egg yolk and vanilla extract, mixing well.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Fold in chocolate chips.

Scoop tablespoon-sized portions of dough onto the prepared baking sheet, spacing them 2 inches apart.

Bake for 10-12 minutes, or until the edges are golden and the centers look slightly underdone. Cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.