It’s finally spooky season and that means watching all my favorite Halloween movies!! For me, Hocus Pocus and Ghostbusters are absolute musts. After watching Ghostbusters this past weekend, I was inspired to make these slimer-inspired Ghostbusters cupcakes.

They’re made with fluffy lime cupcakes, a lime “ectoplasm” curd and are topped with a lime buttercream frosting.

I used a bit of fondant to get Slimer’s face just right, but you could also use frosting if you prefer!

The Perfect Ectoplasm Filling for These Ghostbusters Cupcakes

While I love baking cute things, I wanted these Slimer cupcakes to have a somewhat spooky vibe…or as spooky as possible with a silly fondant face!

I envisioned these cupcakes with an ectoplasm-esque filling and the first thing that popped into my head was lime curd. Ironically lime curd is not naturally green, but it’s the perfect gooey consistency.

With the help of some green gel food coloring, the filling in these cupcakes looks a scene right out of Ghostbusters. It also is delicious and really packs these cupcakes with lime flavor.

Substitutions and Swaps

While I love this recipe just the way it is, I know some of you might not have all of these ingredients on hand!

Below are some swaps and substitutions that can be made in this recipe:

• Unsalted Butter – If you only have salted butter on hand, you can use it in place of the unsalted butter in this recipe. Just be sure to omit the salt that this frosting recipe calls for. You can also use vegan butter in its place!
• Granulated Sugar – I do not recommend reducing the amount of sugar or changing the type of sugar, as it will change the texture of the cupcakes.
• Egg Whites – You can use 2 whole eggs in place of the 3 egg whites in this recipe, or you can use egg whites from a carton.
• Sour Cream – Use full fat yogurt, buttermilk, whole milk, or an alternative yogurt or milk (almond, soy, oat, etc.) if you’re dairy free.
• Whole Milk – You can also use full fat yogurt, buttermilk, sour cream, or an alternative yogurt or milk (almond, soy, oat, etc.) if you’re dairy free.
• Fresh Lime Juice & Zest – In a pinch you could use lemon juice and zest, but I don’t recommend using bottled lemon juice! The flavor just isn’t as strong.
• Vanilla extract – If you don’t have any on hand you can use lime or lemon extract in its place.
• All Purpose Flour – This recipe turns out best with AP flour, but you can use a gluten free flour blend or cake flour if that’s all you have on hand.

Tips for Making the Best Ghostbusters Cupcakes

• Use a cookie scoop to easily fill your cupcake liners and make sure they all have the same amount of batter.
• Ingredients at room temp mix together better! Set cold ingredients ahead of time.
• Bang your cupcake pan on the counter before putting it in the oven. This brings any air bubbles that are trapped in the batter to the surface.
• To give these cupcakes some serious Ghostbusters vibes, fill them with lime curd to look like ectoplasm!
• Use a large, round piping tip to frost your cupcakes! I used an Ateco 805.

Making These Ghostbusters Cupcakes in Advance & Storage Tips

You can make these Ghostbusters cupcakes in advance. If stored unfrosted and unfilled in an airtight container, they can last for 2 days at room temperature or up to a week in the fridge.

These cupcakes can also last up to 3 months in the freezer. If you plan to freeze them, wait to fill and frost them until they’re thawed.

You can also make your frosting and filling up to a week ahead of time or save any leftovers. Leftover lime curd can be stored in an airtight container in the fridge for up to a week and leftover frosting will last in the fridge for up to a month.

Be sure to give the frosting a good stir once it thaws to get the consistency nice and smooth again.

Frosted cupcakes shouldn’t sit out at room temperature for more than a day because the lime curd can spoil. Store them in the fridge in an airtight container once they’re frosted.

Let Me Know What You Think!

If you try making these Ghostbusters cupcakes, I’d love to hear what you think of them! Please leave a rating and comment below.

Tag me @chelsweets and use #chelsweets so that I can see your amazing creations on social media!

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