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

In a saucepan over medium-low heat, melt the butter. Continue to cook, stirring occasionally, until the butter turns a golden brown color and has a nutty aroma. Remove from heat and allow to cool slightly.

In a large mixing bowl, combine the brown sugar, granulated sugar, and slightly cooled brown butter. Mix until well combined.

Add the egg, egg yolks, and vanilla extract to the sugar-butter mixture. Mix until smooth and creamy.

In a separate bowl, whisk together the all-purpose flour, baking soda, and salt.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Fold in the semi-sweet chocolate chips.

Cover the cookie dough with plastic wrap and refrigerate for at least 30 minutes, or up to 24 hours, to allow the flavors to meld and the dough to firm up.

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

Break a graham cracker sheet in half to create two squares. Place them on a baking sheet lined with parchment paper or a silicone mat.

Place two Hershey’s chocolate squares on top of each graham cracker square.

Cut a marshmallow in half horizontally using kitchen shears or scissors.

Place the sticky side of the marshmallow halves on top of the chocolate squares.

Take a portion of the chilled cookie dough and flatten it in the palm of your hand to form a disc.

Place the flattened cookie dough on top of the marshmallow-topped graham cracker. Seal the edges of the cookie dough around the filling, ensuring it is completely covered.

Place the assembled cookies on the prepared baking sheet, leaving space between each cookie to allow for spreading. Bake in the preheated oven for 12-14 minutes, or until the edges are lightly golden.

Remove the cookies from the oven and allow them to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. Enjoy these gooey, indulgent s’mores stuffed chocolate chip cookies with a glass of cold milk or a scoop of vanilla ice cream.