01 -
Heat your oven to 350°F and prep two baking sheets with parchment paper or silicone mats. This keeps things neat and easy.
02 -
In your stand mixer, whip the butter with both sugars until it's light and fluffy. Add the eggs one at a time, then mix in the vanilla until everything's well combined.
03 -
In a separate bowl, whisk together the flour, cocoa powder, cornstarch, salt, and baking soda. Gradually fold this into your wet mixture until just combined - don't overmix!
04 -
Use a medium cookie scoop to portion out the dough into balls. Place them on your prepared sheets, gently flatten each one, then bake for 15-18 minutes until the edges feel firm. Let them cool completely before decorating.
05 -
Beat the egg whites, cream of tartar, powdered sugar, and vanilla in your stand mixer for 5-7 minutes until soft peaks form. If it looks runny or cream-colored, add another ½ cup powdered sugar and beat more.
06 -
Once your icing is white and holds peaks, add 5-7 drops of red gel coloring to get that deep blood-red color. Then beat in 2 tablespoons of water to thin it out - you want it to flow like lava off a spoon.
07 -
This gets messy, so work outside or cover your counter with trash bags! Dip a fork in the red icing, then fling it at the cookies while keeping a firm grip. Continue until you're happy with the splatter pattern.
08 -
Let the icing dry for about an hour before serving. Then enjoy your spooky Halloween masterpieces!