Brown the Butter: In a saucepan, melt the butter over medium heat. Stir continuously until it turns golden brown and releases a nutty aroma. Remove from heat and allow to cool.
Mix Wet Ingredients: In a large mixing bowl, combine the browned butter, brown sugar, and white sugar. Beat until fully mixed.
Add Eggs and Vanilla: Whisk in the egg, egg yolk, and vanilla extract until the mixture is smooth and creamy.
Prepare Dry Ingredients: In a separate bowl, sift together the flour, baking soda, and salt.
Combine: Gradually add the dry ingredients to the wet mixture, half at a time. Mix well after each addition, but stop when the dough starts to get stiff.
Fold in Chocolate Chips: Gently fold in the chocolate chips, ensuring even distribution.
Chill the Dough: Cover the dough and refrigerate for at least 30 minutes. This step is crucial for the perfect texture.
Preheat Oven: Preheat your oven to 350°F (180°C).
Bake: Scoop the dough onto a lined baking sheet, spacing them about 2 inches apart. Bake for 11 minutes or until the edges are golden brown.
Cool & Enjoy: Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack.