These cute and spooky Halloween Mummy Cookies are so fun and delicious to make for the Halloween season! These delicious fudgy chocolate cookies are decorated with a vanilla buttercream and candy eyes to make them into spooky mummy cookies.
These soft cookies have a delicious fudge texture and are fun to make with kids and serve for friends and family.
1. Prepare Melted Butter: Melt the butter and let it cool to room temperature in the fridge (about 20 minutes).
2. Make Cookie Dough: In a large mixing bowl, whisk the cooled melted butter, granulated sugar, and brown sugar for 1 minute. Add the egg, egg yolk, and vanilla extract and mix until combined. In a separate bowl, stir together the flour, cocoa powder, baking powder, baking soda, and salt. Add dry ingredients to the wet mixture and mix with a spatula until just combined.
3. Chill Dough: Place dough in the fridge to set for 30 minutes. Meanwhile, preheat the oven to 350ºF (175ºC) and prepare a baking sheet with baking paper.
4. Scoop and Bake: Using a medium 2-ounce scoop (or ¼ cup), scoop dough, roll into a ball, and flatten slightly (about 0.8 inches thick). Bake 6 cookies per tray for 9-10 minutes. Let cool 3 minutes on tray, then transfer to a rack.
5. Make Vanilla Buttercream: Add all buttercream ingredients to a bowl and mix for 3 minutes on high speed until light and creamy. Smooth with a spatula to remove air bubbles.
6. Decorate: Add buttercream to a piping bag (no tip), cut off the end (0.2 inches). Attach candy eyes with a dab of buttercream, then pipe zigzag “bandages,” leaving a small gap for eyes.
Problem: Cookies spread too much and are flat.
Cause: Butter too warm or not enough chilling.
Fix: Cool butter fully and chill 30 min.
Problem: Cookies are hard or dry.
Cause: Overbaking or too much flour.
Fix: Bake only 9–10 minutes, weigh flour accurately.
Problem: Buttercream not smooth.
Cause: Butter too cold or not mixed enough.
Fix: Ensure room temperature butter and mix 3 minutes.

These Halloween Mummy Cookies are delicious fudgy chocolate cookies decorated with vanilla buttercream and candy eyes. Soft, rich, and spooky perfect for Halloween fun!