How to level up the classic Chocolate Chip Cookies? By using this technique by Sarah Copeland that makes for layer after layer of salty chocolate goodness, that is why it is called the Thousand-Layer Chocolate Chip Cookies recipe.
4largeegg yolksat room temperature, plus 1 large egg, lightly beaten, for brushing
1teaspoonpure vanilla extract
2 1/4cupall-purpose flourplus more for dusting
3/4teaspoonbaking soda
3/4teaspoonSea salt
9ouncesbittersweet chocolate
Instructions
Start The Cookie Dough: Heat the oven to 375˚F/190°C/gas 5. Line two baking sheet/trays with parchment/baking paper. Cream butter and both sugars together with an electric mixer on medium-high speed until light and fluffy, about 3 minutes. Beat in egg yolks, two at a time, followed by vanilla.
Add The Dry Ingredients: Whisk together the flour, baking soda/bicarbonate of soda, and salt. Stir dry ingredients into butter mixture on low speed until just mixed. Stop and scrape down the bowl to make sure all the butter is evenly incorporated and give the dough a final mix.
Chill The Dough: Divide the dough into 3 portions. Put each dough portion on large piece of plastic wrap/cling film, and pat into a 4-by-6-in/10-by-15-cm rectangle. Wrap and refrigerate on a flat shelf in the fridge until well chilled, about 30 minutes. Meanwhile, coarsely chop the chocolate into thin shards using a serrated knife. Set aside.
Roll Out The Dough: When the dough is chilled, lay one portion on a lightly floured countertop. Sprinkle with half of the chocolate and top with another piece of dough. Repeat with remaining chocolate and dough until you have a slab of dough with two layers of chocolate. Dust lightly and evenly with flour and roll gently with a rolling pin into a large 9-by 6-in/23-by-15-cm rectangle that’s about 1 1/2 in/ 4 cm thick.
Shape The Cookies: Using a 2-in/5-cm round cookie or biscuit cutter or a thin rimmed glass, cut out ten rounds of dough. Gather the scraps together, pat lightly, and cut out remaining cookies. Divide half of the cookies/biscuits between the 2 prepared baking sheet/trays, leaving about 3 in/7.5 cm between cookies/biscuits since they will spread. Brush the tops of each cookie with the beaten egg, and with a light hand, sprinkle with a few grains of sea salt, or leave plain.
Bake The Cookies: Bake until the cookies are set, 12 to 15 minutes, switching the sheets halfway through top to bottom if you’re baking two sheets at a time. Let cookies/biscuits cool slightly, about 3 minutes, then transfer the cookies with a thin spatula to a wire rack to cool completely {or, just slide the parchment/baking paper directly onto the cooling rack}. Let the baking sheets/trays cool completely before using to bake the remaining dough (lining with more parchment/baking paper if needed). Bake as directed, switching sheets top to bottom half way through baking, and cool.