Mix Dry Ingredients: In a bowl, combine flour, baking soda, and salt. Set aside.
Whisk Wet Ingredients: In a separate large bowl, mix melted butter with brown and white sugar until creamy and smooth.
Add Eggs and Vanilla: Beat in the egg, egg yolk, and vanilla until well combined.
Combine Mixtures: Slowly fold dry ingredients into wet until just mixed. Avoid overmixing.
Add Chocolate Chips: Gently stir in the chocolate chips.
Chill the Dough: Cover and refrigerate for at least 30 minutes to enhance flavor and texture.
Bake: Preheat oven to 350°F (175°C). Scoop dough balls (2 tablespoons each) onto a parchment-lined baking sheet. Bake for 9–11 minutes until edges are golden.
Cool and Serve: Let cookies rest for 5 minutes before transferring to a wire rack. Enjoy warm and chewy!