Preheat the oven to 350 degrees. Line a couple baking sheets with parchment paper and set aside.
In the bowl of a stand mixer, combine the butter, brown sugar and sugar. Use the paddle attachment to cream together until smooth.
Add in the egg, vanilla and corn syrup. Mix well, scraping the sides often.
Add the dry ingredients - baking soda, salt, cocoa and flour. Mix well, scraping the sides often and mixing again.
Using a large ice cream scoop (or about 3 tablespoons worth) to divide the dough into 8-9 cookies. Place on the parchment lined baking sheets, leaving about 3 inches between each cookie as they will spread.
Bake in the preheated oven for 10-11 minutes or until the edges are set and the center is no longer glossy. Do not overbake. Allow to cool before decorating.
For the topping, in a medium bowl combine the heavy cream and the chocolate chips. Heat in the microwave for one minute. Stir thoroughly until smooth. Allow to cool slightly before topping the cookies.
To decorate the cookies, scoop out a spoonful of the chocolate ganache and spread over the tops of each cookie. Immediately sprinkle with the candy coated chocolate chips.
Notes
Storage: Cookies can be stored in an airtight container in the fridge for up to 7 days.