Step 1: Brown the Butter - Place unsalted butter in a medium saucepan over medium heat. Allow it to melt, stirring frequently. Continue to cook until it turns golden brown and develops a nutty aroma. Remove from heat and cool slightly.
Step 2: Mix the Sugars - In a large mixing bowl, combine the cooled browned butter, light brown sugar, and granulated sugar. Mix until smooth.
Step 3: Add the Eggs and Vanilla - Add the eggs and egg yolk along with the vanilla extract. Beat until light and fluffy.
Step 4: Combine the Dry Ingredients - In a separate bowl, whisk together the all-purpose flour, salt, baking soda, and baking powder. Gradually add to the wet ingredients, mixing until just combined.
Step 5: Incorporate the Chocolate - Fold in the semi-sweet chocolate chips and chocolate chunks until evenly distributed.
Step 6: Chill the Dough - Cover the dough with plastic wrap and chill in the refrigerator for at least 30 minutes.
Step 7: Bake the Cookies - Preheat oven to 350°F (175°C). Drop rounded tablespoons of dough onto a lined baking sheet, leaving space between each cookie. Sprinkle with fine sea salt.
Step 8: Enjoy! - Bake for 10-12 minutes until edges are golden and centers are set. Cool on the baking sheet before transferring to a cooling rack.
