01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking soda, and salt in a medium bowl.
03 - In a large bowl, beat melted butter with brown sugar and granulated sugar until smooth.
04 - Incorporate the egg, egg yolk, and vanilla extract into the wet mixture and combine thoroughly.
05 - Gradually add dry ingredients to the wet mixture, stirring until just blended.
06 - Gently fold chocolate chips into the dough until evenly distributed.
07 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 10 to 12 minutes, until edges are golden and centers remain soft.
09 - Allow cookies to cool on baking sheets for 5 minutes before transferring to a wire rack to cool completely.