Preheat the oven to 350 degrees. Add parchment paper to a 9X11 baking sheet.

Mix the softened butter and both sugars in a bowl. Beat for 2 minutes with a mixer until combined.

Add the egg and vanilla, and mix.

Add a good amount of black food gel (5-6 drops) and mix. You can add more as needed.

Add the flour, cocoa powder, baking soda, and salt at once. Mix with a mixer to form the cookie dough.

Add the milk and blend until smooth.

Pour in the chocolate chips and fold with a spatula.

Use a 2-inch cookie scoop or place 2 teaspoons of cookie dough on the prepared baking sheet. Space the cookies about 2 inches apart.

Slightly press down each cookie with the palm of your hand to flatten it out a bit.

Put the candy eyeballs all over the cookies. Leave some space in between each one.

Bake for 10-12 minutes.

Let the cookies cool for 5 minutes, then enjoy!