Prepare the Dough:

• In a large bowl, mix flour, cornstarch, baking soda, baking powder, and salt.
• In another bowl, cream together the butter and sugar using an electric mixer for 2 minutes until light and fluffy. Add the egg, peanut butter, and vanilla, mixing until combined.
• Gradually add the dry ingredients to the wet mixture, stirring until combined.
• Add purple gel food coloring to the dough and mix evenly.

Chill the Dough:

• Scoop tablespoon-sized balls of dough onto a baking sheet lined with parchment paper.
• Cover with plastic wrap and refrigerate for at least 2 hours, or overnight.

Bake the Cookies:

• Preheat the oven to 350°F (175°C).
• Roll the chilled dough balls in Halloween sprinkles or sanding sugar.
• Place the cookies 2 inches apart on a lined baking sheet and bake for 9-11 minutes, until puffed and starting to crack.

Add the Witch Hat:

• Remove the cookies from the oven and immediately press a Hershey’s Hug or Kiss into the center of each cookie.
• Place the tray in the freezer for 10 minutes to prevent the chocolate from melting.