Whip Up Spooky Fun with Green Slime Cupcakes for Halloween!
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These Green Slime Cupcakes are a monstrously fun Halloween treat, with vibrant green cake, black-and-green frosting swirls, and dripping slime!
Looking for something gruesomely good for your Halloween dessert table? These cupcakes look like they came straight from a mad scientist’s lab! With a generous coating of spooky sprinkles, gooey green decorating gel, and a gumball on top, they’ll catch everyone’s eye. Perfect for Halloween parties, monster-themed birthdays, or a frightfully fun baking session with the kids.
These Green Slime Cupcakes use a boxed cake mix for a quick baking shortcut, with homemade vanilla buttercream and a fun decorating technique that creates a delightfully messy monster-inspired finish.
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Why You’ll Love These Green Slime Cupcakes
- Wonderfully gruesome presentation: Dripping green slime and contrasting black frosting make these cupcakes look delightfully disgusting—in the best way!
- A surprise inside: The bright green cake keeps the monster theme going even after that first bite.
- A shortcut for busy bakers: Starting with a boxed French vanilla cake mix saves time, leaving you more freedom to have fun with the decorations.
- Get creative with the slime: Adjust the green coloring and decorating gel to make your cupcakes as bright, messy, and monstrous as you like.
- Great for Halloween parties: This recipe makes 12 individually decorated cupcakes, perfect for a spooky dessert spread.
- Fun to decorate together: Kids can help with the sprinkles and finishing touches while adults handle the piping.
For even more frightfully delicious treats, check out our collection of Halloween Recipes!
How Do I Make Green Slime Cupcakes?
Check out the recipe card below—you can print or save it for later—please don‘t forget to leave a star rating!
Green Slime Cupcakes
These Green Slime Cupcakes use a boxed cake mix for a quick baking shortcut, with homemade vanilla buttercream and a fun decorating technique that creates a delightfully messy monster-inspired finish.
Ingredients
For the Cupcakes
- 15.25 ounce box vanilla cake mix
- 3 large eggs
- 1 cup whole milk
- ½ cup unsalted butter softened
- neon green gel food coloring as needed
For the Frosting
- 2 cups unsalted butter softened
- 5 cups powdered sugar icing sugar
- 5 tablespoons heavy cream double cream
- 3 teaspoons pure vanilla extract
- black gel food coloring as needed
- neon green gel food coloring as needed
Halloween Decorations
- 2 ounces package green sprinkle mix
- 2 ounces package black sprinkle mix
- 2 tubes Wilton Green Sparkle Gel
- 12 green gumballs
SUGGESTED PRODUCTS
Instructions
Make the Cupcakes
- Preheat the oven to 350°F (180°C / Gas Mark 4). Line cupcake pans with 12 black cupcake liners and set them aside.
- Using an electric standing or hand mixer, beat the cake mix, eggs, milk, and butter until combined and smooth.
- Add a few drops of neon green gel food coloring and mix until evenly colored. Add more coloring as needed to achieve a vibrant green.
- Use an ice cream scoop to divide the batter between the cupcake liners. Fill about ¾ full.
- Bake in the preheated oven for 20 minutes or until an inserted toothpick comes out clean.
- Remove the cupcakes from the oven and leave to cool in the pan for 5 minutes before transferring to a wire rack to cool completely before decorating.
Make the Frosting
- Using an electric stand or handheld mixer, beat the butter, powdered sugar, cream, and vanilla together until smooth and stiff peaks form.
- Transfer approximately 1½ cups of frosting to a separate bowl and mix in a few drops of black gel food coloring.
- Add 6–8 drops of neon green gel food coloring to the remaining frosting and mix until evenly colored.
- Fit a large piping bag with a star tip and place it inside a tall glass, folding the top of the bag over the rim. Spoon approximately 1 cup of green frosting down one side of the bag and 1 cup of black frosting down the other side. Set aside.
Decorate the Cupcakes
- Combine the green and black sprinkle mixes in a medium bowl. Set aside.
- Using a medium ice cream scoop, place a generous scoop of green frosting onto each cooled cupcake. Smooth the frosting into a thick, flat disk using an offset spatula.
- Press the frosted tops into the combined Halloween sprinkles until completely coated.
- Add a swirl of the black and green frosting onto the sprinkles layer. Drizzle green sparkle decorating gel around the swirl to create a dripping slime effect.
- Pipe a further tall swirl of frosting on top and add more green sparkle gel.
- Place a green gumball on top of each cupcake. Serve, and Happy Halloween!
Notes
Tips
- Gel food coloring works best for achieving a vibrant green cake without adding too much extra liquid to the batter.
- Make sure the cupcakes are completely cool before decorating, or the buttercream may melt.
- For the two-tone frosting effect, place the green and black buttercream on opposite sides of the piping bag.
- The gumballs are decorative and should be removed before serving to young children because they pose a choking hazard.
Substitutions
- If French vanilla cake mix is unavailable, you can use regular vanilla cake mix, though the flavor may differ.
- Use any Halloween-themed green-and-black sprinkles you can find.
- Green sparkle decorating gel is ideal for the slime effect, but other edible green decorating gels may also work.
Storage
- Decorate these cupcakes shortly before serving to keep the sprinkles and slime decorations looking their best.
- For storage, follow the guidance for your chosen frosting and cake mix, particularly if the cupcakes need refrigeration.
Nutrition
Calories: 720kcal | Carbohydrates: 81g | Protein: 4g | Fat: 44g | Saturated Fat: 27g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 11g | Trans Fat: 2g | Cholesterol: 152mg | Sodium: 281mg | Potassium: 88mg | Fiber: 0.4g | Sugar: 65g | Vitamin A: 1366IU | Vitamin C: 0.04mg | Calcium: 126mg | Iron: 1mg
Nutritional information is always approximate and will depend on the quality of ingredients used and serving sizes. If you need exact calories and macros, please do your own calculations.
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Halloween Dinner Party Menu Suggestions
You’ve made the dessert, but what about the rest of the feast? We’ve put together everything you need for a spooky dinner party menu.
- Appetizer: Jalapeño Popper Mummies
- Soup: Creamy Cheesy Broccoli Soup with Crunchy Homemade Croutons
- Salad: Iceberg Lettuce Wedge Salad with Bacon & Blue Cheese Dressing
- Main Dish: Reverse Sear Strip Steaks
- Side Dish: Tri-Color Roasted Rosemary Potatoes
- Beverage: Toxic Waste Cocktail
A Monstrously Good Halloween Treat!
Halloween is the perfect excuse to have a little fun in the kitchen, and these Green Slime Cupcakes certainly don’t hold back! Whether you’re baking for a party or just getting into the spooky spirit, they’ll bring plenty of smiles (and maybe a few squeals!). Happy Halloween!
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