Preheat the oven to 350 F. In a medium bowl, whisk together flour, cocoa powder, salt, and baking soda. In a large bowl, combine butter with granulated sugar and brown sugar until fluffy.
Add in egg and vanilla extract, and mix until it is smooth. Add the flour mixture in and mix until it is fully combined. Add in the red food coloring and mix until it is fully red.
Using a cookie scoop, place the cookies onto a large ungreased baking sheet at least 2-inches apart and bake for 10-12 minutes.
Remove from the oven, and decorate with the candy eyes.
