A spooky Halloween cupcake recipe perfect for slime-loving kids, these Slime Monster Cupcakes are sure to be a hit at your Halloween festivities!

Halloween Slime Monster Cupcakes Recipe

Are your kids obsessed with slime?

These Slime Monster Cupcakes are a fun way to pay homage to every kids’ favorite hobby these days – SLIME! (This Edible Gummy Bear Slime recipe is always a winner!)

You can make these Slime Monster Cupcakes two ways – to just look like a slime monster perched on top, or you can actually fill them with “slime” (aka, dyed vanilla pudding).

The second option can be a bit messy, so be prepared! If serving at a Halloween party where people will be wearing costume, you might want to warn them about the slime inside first!

While we provided a recipe for homemade chocolate cupcakes, feel free to swap in a boxed chocolate cake mix. The real winner here is that delicious homemade buttercream frosting – which would be a crime to replace with the jarred stuff.

However, if you need a dairy-free alternative, check out Stacey’s Coconut Oil Frosting.

Ingredients for Slime Cupcakes

1 1/3 cups all-purpose flour
1/4 teaspoon baking soda
2 teaspoons baking powder
3/4 cup unsweetened cocoa powder
1/8 teaspoon salt
3 tablespoons butter, softened
1 1/2 cups white sugar
2 eggs
3/4 teaspoon vanilla extract

For the vanilla buttercream:

1 cup butter, softened
3-4 cups icing sugar
2 teaspoons vanilla extract
pinch salt
2-3 tablespoons milk or heavy cream
Green food dye, optional

For the decorations:

1 cup green candy melts
1 Tablespoon shortening or vegetable oil
24 large marshmallows
48 candy eyes

Optional Slime Filling:

Prepared vanilla pudding
green food dye

Tip: skip the slime filling or at least warn guests if serving at an event to prevent unexpected slime-costume disasters.

Kitchen Tools You May Find Helpful

How to Make Slime Cupcakes

Preheat oven to 375 degrees F.

Line a muffin pan with themed cupcake liners.

In a large bowl, sift together the flour, baking powder, baking soda, cocoa and salt. Set aside.

In a large bowl, cream together the butter and sugar until light and fluffy, about 2 minutes.

Add the eggs one at a time, beating well with each addition, then stir in the vanilla.

Add the flour mixture alternately with the milk; beat well. Fill the muffin cups 3/4 full.

Bake for 15 to 18 minutes, until a toothpick inserted into the cake comes out clean.

How to make slime monster cupcakes photo collage

Place softened butter into a bowl and beat in 2 cups of icing sugar. Add 2 Tablespoons heavy cream and vanilla.

Add remaining icing sugar 1/2 cup at a time until you reach your desired consistency. Add food colouring, if using.

Spoon the frosting into a piping bag with no tip or a circular tip.

If adding a slime filling, dye the vanilla pudding green, and then scoop into a piping bag. Make a hole in the center of the cupcake and fill with the green pudding.

TIP: While you can use a knife to make a hole in your cupcakes, these handy Cupcake Corer tools make this step a breeze!

Swirl the frosting onto the cooled cupcakes.

Melt the candy melts with the shortening for 25 seconds, stir, and reheat if necessary.

Place a large marshmallow in the center of each cupcake and spoon 1-2 Tablespoons of the candy melts overtop. Use the back of a spoon to help the candy melts move if needed.

Repeat with the other ghost cupcakes. After each ghost has dried for about 5 minutes, attempt to attach the eyes – if the candy melts are still too soft, give it another couple minutes before re-attempting.

Pin these Slime Cupcakes on Pinterest:

Creepy Slime Monster Cupcakes! Perfect for Halloween or slime birthday party treats!

Grab your free printable copy of our Slime Cupcakes for Hallowen:

Yield: 12

Easy Slime Monster Cupcakes

A spooky Halloween recipe perfect for Slime fans, these Slime Monster cupcakes have an optional slime filling!

Ingredients

1 1/3 cups all-purpose flour
1/4 teaspoon baking soda
2 teaspoons baking powder
3/4 cup unsweetened cocoa powder
1/8 teaspoon salt
3 tablespoons butter, softened
1 1/2 cups white sugar
2 eggs
3/4 teaspoon vanilla extract

For the vanilla buttercream:

1 cup butter, softened
3-4 cups icing sugar
2 teaspoons vanilla extract
pinch salt
2-3 tablespoons milk or heavy cream
Green food dye, optional

For the decorations:

1 cup green candy melts
1 Tablespoon shortening or vegetable oil
24 large marshmallows
48 candy eyes

Optional Slime Filling:

Prepared vanilla pudding
green food dye

Instructions

Preheat oven to 375 degrees F.
Line a muffin pan with themed cupcake liners.
In a large bowl, sift together the flour, baking powder, baking soda, cocoa and salt. Set aside.
In a large bowl, cream together the butter and sugar until light and fluffy, about 2 minutes.
Add the eggs one at a time, beating well with each addition, then stir in the vanilla.
Add the flour mixture alternately with the milk; beat well. Fill the muffin cups 3/4 full.
Bake for 15 to 18 minutes, until a toothpick inserted into the cake comes out clean.
Place softened butter into a bowl and beat in 2 cups of icing sugar. Add 2 Tablespoons heavy cream and vanilla.
Add remaining icing sugar 1/2 cup at a time until you reach your desired consistency. Add food colouring, if using.
Spoon the frosting into a piping bag with no tip or a circular tip.
If adding a slime filling, dye the vanilla pudding green, and then scoop into a piping bag. Use a cupcake corer to make a hole in the center of the cupcake and fill with the green pudding.
Swirl the frosting onto the cooled cupcakes.
Melt the candy melts with the shortening for 25 seconds, stir, and reheat if necessary.
Place a large marshmallow in the center of each cupcake and spoon 1-2 Tablespoons of the candy melts overtop. Use the back of a spoon to help the candy melts move if needed.
Repeat with the other ghost cupcakes. After each ghost has dried for about 5 minutes, attempt to attach the eyes - if the candy melts are still too soft, give it another couple minutes before re-attempting.