These whimsical slime-filled Halloween Slime Cookies are fun and spooky delights everyone at your Halloween party will love! Make these delicious Halloween desserts for kids, or as a spooktacular Halloween party favor that is sure to be a crowd favorite.
Get ready to embark on a delightfully whimsical baking adventure with our Slime Cookies! Perfect for parties, Halloween celebrations, or any occasion that demands a touch of playfulness, these cookies are set to steal the spotlight.
Loved by both kids and adults, these Slime Cookies offer a delectable journey through a world of flavors and textures. Learn how to create these gooey, eye-catching treats that are sure to leave everyone craving for more.
Why You’ll Love This Recipe
With a gooey slime filling, this whimsical Halloween recipe is bound to be a hit with little ones and even teens at your Halloween party. Kids love edible slime more than anything, and these slime-filled cookies add an element of surprise and whimsy to the spooky holiday they already love.
Adults will also be pleasantly surprised by these seemingly normal chocolate cookies. From the outside, they just look like decorated Halloween Cookies. As they bite into them, the gooey slime center will catch them by surprise and make the cookie taste even better. The bottomline is, these Slime Cookies are an excellent Halloween dessert for kids, as well as unique Halloween party favors for kids and adults alike.
Supplies and Equipment Needed:
- Cookie sheet pans
- Parchment paper
- Non-stick spray
- Stand mixer
- Mixing bowls
- Measuring cups and spoons
- Syringe
- Cooling rack
- Microwave-safe dish
Ingredients
Here’s a list of ingredients you will need to make these whimsical Halloween Slime Cookies.
Cookie Base Ingredients:
- 1 cup unsalted butter, softened
- ¾ cup sugar
- ⅔ cup brown sugar
- 2 eggs
- 1 teaspoon vanilla
- 2 ¼ cups flour
- ⅔ cup cocoa powder
- 1 teaspoon baking soda
- ½ teaspoon salt
Slime Frosting Ingredients:
- 1 cup unsalted butter, softened
- 3 cups powdered sugar
- 1 teaspoon salt
- 1 teaspoon vanilla
- 2-3 tablespoons milk (if needed)
- Neon green food coloring
- Sprinkles to garnish
How To Make This Recipe
Slime Cookie Base Instructions
- Preheat the oven to 350 degrees. Place parchment paper on a couple of cookie sheet pans or spray them with non-stick spray. Set them aside.
- In the bowl of a stand mixer, combine the softened butter and sugars. Cream until smooth.
- Add in the eggs, vanilla, baking soda, and salt. Combine well, scraping down the sides and mixing again.
- Combine the flour and cocoa powder and mix well. The mixture will be thick.
Scoop out enough dough (about the size of a golf ball) and flatten slightly into a disc. Place on the prepared cookie sheets, leaving space between the cookies for spreading during baking. Top each cookie with about a teaspoon’s worth of sprinkles.
Bake in the preheated oven for 10-12 minutes or until the edges are set.
Frosting Instructions
While the cookies are baking, make the buttercream frosting. In the bowl of a stand mixer, combine the softened butter, salt, vanilla, and about half of the powdered sugar. Cream until smooth.
Add in the remaining powdered sugar and about 1 tablespoon’s worth of milk. While it mixes, if you need to add more milk to thin it, only add 1 tablespoon at a time until thoroughly mixed. Add in the neon green food coloring and whip on high speed for about a minute. Scrape the sides and mix again.
Transfer about a cup’s worth at a time to a microwave-safe dish and heat for about 30 seconds, or until the frosting melts slightly. Stir.
Fill the syringe with the melted frosting.
Once the cookies are removed from the oven, immediately inject the melted buttercream into the center of the cookie while it’s still hot and pliable. If you wait too long, the cookie will harden, preventing the frosting from filling the center. The frosting should ooze out of the cracks and overflow from the cookie.
Refill the syringe when needed and fill all the cookies. Follow up with a few more sprinkles if desired. Allow the cookies to cool for the frosting to set back up. Enjoy!
How To Store Slime Cookies
These Slime Cookies are a fantastic way to inject some fun and whimsy into your baking. Loved by both kids and adults, they make perfect treats for parties and Halloween celebrations.
Follow our easy recipe, and watch as your friends and family are amazed by these gooey, colorful delights. Store them in an airtight container to enjoy for up to three days!
More fun Halloween desserts:
- Cookie Monster Cookies
- Halloween Hot Cocoa Bombs
- Hocus Pocus Witches Brew Cauldrons
- Spooktacular Ghost Cookies
- Colorful Halloween Monster Cupcakes
- Halloween Graveyard Cupcakes
Slime Cookies: A Whimsical Delight for Kids and Adults Alike
Equipment
- Supplies and Equipment Needed:
- – Cookie sheet pans
- Parchment Paper
- Non-stick spray
- Stand mixer
- Mixing bowls
- Measuring cups and spoons
- – Syringe
- – Cooling rack
- – Microwave-safe dish
Ingredients
Ingredients:
For the cookie base:
- – 1 cup unsalted butter softened
- – ¾ cup sugar
- – ⅔ cup brown sugar
- – 2 eggs
- – 1 teaspoon vanilla
- – 2 ¼ cups flour
- – ⅔ cup cocoa powder
- – 1 teaspoon baking soda
- – ½ teaspoon salt
For the Slime Frosting:
- – 1 cup unsalted butter softened
- – 3 cups powdered sugar
- – 1 teaspoon salt
- – 1 teaspoon vanilla
- – 2-3 tablespoons milk if needed
- – Neon green food coloring
- – Sprinkles to garnish
Instructions
Directions:
- Preheat the oven to 350 degrees. Place parchment paper on a couple of cookie sheet pans or spray them with non-stick spray. Set them aside.
- In the bowl of a stand mixer, combine the softened butter and sugars. Cream until smooth.
- Add in the eggs, vanilla, baking soda, and salt. Combine well, scraping down the sides and mixing again.
- Combine the flour and cocoa powder and mix well. The mixture will be thick.
- Scoop out enough dough (about the size of a golf ball) and flatten slightly into a disc. Place on the prepared cookie sheets, leaving space between the cookies for spreading during baking. Top each cookie with about a teaspoon’s worth of sprinkles.
- Bake in the preheated oven for 10-12 minutes or until the edges are set.
- While the cookies are baking, make the buttercream frosting. In the bowl of a stand mixer, combine the softened butter, salt, vanilla, and about half of the powdered sugar. Cream until smooth.
- Add in the remaining powdered sugar and about 1 tablespoon’s worth of milk. While it mixes, if you need to add more milk to thin it, only add 1 tablespoon at a time until thoroughly mixed. Add in the neon green food coloring and whip on high speed for about a minute. Scrape the sides and mix again.
- Transfer about a cup’s worth at a time to a microwave-safe dish and heat for about 30 seconds, or until the frosting melts slightly. Stir.
- Fill the syringe with the melted frosting.
- Once the cookies are removed from the oven, immediately inject the melted buttercream into the center of the cookie while it’s still hot and pliable. If you wait too long, the cookie will harden, preventing the frosting from filling the center. The frosting should ooze out of the cracks and overflow from the cookie.
- Refill the syringe when needed and fill all the cookies. Follow up with a few more sprinkles if desired.
- Allow the cookies to cool for the frosting to set back up. Enjoy!
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