Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper.
In a large mixing bowl, cream together the softened butter, brown sugar, and white sugar until the mixture is light and fluffy.
Beat in the egg and add the vanilla extract. Mix well until the ingredients are thoroughly combined.
In a separate bowl, whisk together the all-purpose flour, unsweetened cocoa powder, and baking soda.
Gradually add the dry ingredient mixture to the wet ingredients, mixing until a soft cookie dough forms.
Gently fold in the halved caramel squares, dark chocolate chips, and pretzels until they are evenly distributed throughout the cookie dough.
Using a cookie scoop or a spoon, drop rounded portions of dough onto the prepared baking sheets, leaving enough space between each cookie.
Bake in the preheated oven for approximately 10-12 minutes or until the edges are set but the centers are still soft. Be cautious not to overbake.
Allow the cookies to cool on the baking sheets for a few minutes before transferring them to a wire rack to cool completely.
Once the cookies have cooled, serve and enjoy the delightful combination of sweet chocolate, gooey caramel, and crunchy pretzels!