Preheat your oven to 325°F. Line a baking sheet with parchment paper or a silicone mat and set aside.
Whisk together the all-purpose flour, black or dark cocoa powder, baking soda, cornstarch and salt. Set aside.
1¾ cup all-purpose flour, ¾ cup black cocoa powder, 1 teaspoon baking soda, 1½ teaspoons cornstarch, ½ teaspoon salt
Add the melted and cooled butter, granulated sugar, and brown sugar to the bowl of a stand mixer. Mix until fluffy. About 2 minutes.
12 tablespoons unsalted butter, ¾ cup granulated sugar, ½ cup light brown sugar
Add in the eggs, vanilla extract and mint extract (if using). Mix again until smooth.
2 large eggs, 2 teaspoons vanilla extract, ¼ teaspoon mint extract
Slowly add in the dry ingredients and mix until just incorporated. Make sure not to overmix.
Lastly, fold in your chocolate and mint chocolate chips.
¾ cup dark chocolate chips, ½ cups mint chocolate chunks
Cover your dough with plastic wrap and chill in the fridge for at least 30 minutes. It may be chilled overnight.
Once your dough has chilled, form rough balls of dough. Use 3 tablespoons of dough for extra-large cookies and 2 tablespoons for large cookies. Using a digital kitchen scale to weigh your dough ensures that each cookie is the same size. Extra large cookies are 60g and large cookies are 50g. Place your candy monster eyes and sprinkles or green candy pearls gently on top of your dough. candy eyes, green candy pearls
To prevent your cookies from spreading, chill these prepared dough balls in the freezer for 10 minutes.
Bake for 12-14 minutes at 325 F. When the cookies are removed from the oven, more sprinkles can gently be pressed into the top of the cookie.
Allow the cookies to cool slightly on the baking sheet, then transfer them to a wire rack to finish cooling.