Preheat the Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking soda, and salt. Set this mixture aside for later.

Combine Sugars and Butter: In a large mixing bowl, combine the melted butter, brown sugar, and granulated sugar. Mix until smooth and well combined.

Add Eggs and Vanilla: Add the egg, egg yolk, and vanilla extract to the sugar mixture. Whisk until the mixture is light and fluffy.

Dry Ingredients: Gradually add the dry ingredients to the wet mixture, mixing just until combined.

Fold in Chocolate Chips: Gently fold in the chocolate chips using a spatula, ensuring they are evenly distributed throughout the dough. You can use semi-sweet, milk, or a combination of both for variety.

Scoop Dough: Using a cookie scoop or a tablespoon, drop rounded balls of dough onto the prepared baking sheet. Leave about 2 inches of space between each cookie to allow for spreading.

Chill the Dough: For thicker, chewier cookies, chill the dough in the refrigerator for about 30 minutes before baking.

Bake: Bake the cookies in the preheated oven for 10-12 minutes, or until the edges are golden brown but the centers are still soft.

Cool and Enjoy: Allow the cookies to cool on the baking sheet for about 5 minutes, then transfer them to a cooling rack to cool completely. Enjoy your freshly baked chocolate chip cookies with a glass of milk or your favorite beverage!