Slimer Ghostbusters Cupcakes Recipe

If you’re a fan of the Ghostbusters or just love a fun, festive treat, you’re going to flip for this Slimer Ghostbusters Cupcakes Recipe. These cupcakes are seriously the cutest and yummiest way to bring a bit of spooky fun to your kitchen. Fluffy lime-flavored cupcakes filled with tangy lime curd “slime” and topped with a bright electric green frosting that looks just like Slimer himself—what’s not to love? I absolutely love how this turns out every time, and more importantly, people gobble them up faster than you can say “ghostbusters!” Let me walk you through everything so you can wow your crew with these slime-tastic delights.

this …

Ingredients You’ll Need

Getting the right ingredients for this Slimer Ghostbusters Cupcakes Recipe is key. You’ll want room temperature eggs and dairy for that perfect batter, plus fresh lime juice and zest to pack a punch of citrusy freshness. The fondants might seem tricky, but don’t worry—I’ll share tips to make it all manageable.

• Unsalted Butter: Essential for creamy batter and frosting, make sure it’s softened for easy mixing.
• Granulated Sugar: Gives just the right sweetness to balance the tart lime.
• Egg Whites and Eggs: Room temperature eggs help the cake rise well and stay moist.
• Full-Fat Sour Cream: Adds moisture and slight tang, enhancing the cupcake texture.
• Whole Milk: Keeps the batter smooth and tender.
• Lime Juice and Lime Zest: Fresh is best here to maximize brightness and zing.
• Vanilla Extract or Vanilla Bean Paste: Adds warmth and depth to the lime flavor.
• Green Gel Food Coloring: Use electric or neon shades to get that Slimer green!
• All-Purpose Flour: The structure of the cupcakes depends on it, so measure carefully.
• Baking Powder: Your rising agent for fluffy cupcakes.
• Fine Salt: Balances the sweetness and highlights flavors.
• Powdered Sugar: For the smooth, creamy frosting.
• Red, Black, Yellow, and White Fondant: These are for decorating Slimer’s fun face—don’t worry if you’re new to fondant, I’ll show you how to keep it simple!

Variations

I love that this Slimer Ghostbusters Cupcakes Recipe is super versatile. Over time, I’ve had fun tweaking the lime flavor intensity and even tried swapping out a few ingredients to accommodate friends’ dietary needs. Feel free to make it your own!

• Dairy-Free Version: I replaced sour cream with coconut yogurt and used a plant-based milk—still tangy and moist!
• Less Sweet Option: Cutting back a bit on sugar works perfectly if you prefer a tart lime punch.
• Color Variations: Try different green shades or even a glow-in-the-dark edible dust for Halloween parties.
• Alternative Fillings: I once tried a lemon curd instead, which gave a nice twist while keeping the zesty feel.

How to Make Slimer Ghostbusters Cupcakes Recipe

Step 1: Cream and Combine Your Wet Ingredients

Start by creaming the unsalted butter with the granulated sugar until it’s light and fluffy—this takes about 3-5 minutes with an electric mixer on medium speed. Don’t skip this step because a well-creamed base keeps your cupcakes tender. Then add the egg whites, sour cream, milk, lime juice, vanilla, and lime zest. Mix everything gently until smooth. I discovered this trick of keeping ingredients at room temperature really makes mixing easier and results in a smoother batter without lumps.

Step 2: Mix Dry Ingredients Separately

In a separate bowl, whisk together the flour, baking powder, and salt. This keeps the leavening even throughout your batter, so you don’t get those weird dense spots. Once mixed, gradually add the dry mix into the wet ingredients, stirring gently to combine. You want a smooth batter but don’t over-mix—stop when you see just a few streaks of flour.

Step 3: Fold in the Eggs and Add Color

Next, beat in the whole eggs and the second batch of sugar and salt until everything’s fully combined. This step is key for the final rise and structure. Stir in the electric green gel food coloring and mix until the color is consistent—you’ll see that vibrant, spooky green emerge beautifully here. I usually add a tiny bit at a time so I don’t end up with an overly dark shade.

Step 4: Bake Your Cupcakes

Divide the batter evenly into lined cupcake tins, filling each about two-thirds full. Bake at 350°F (175°C) for about 15 minutes, or until a toothpick inserted in the center comes out clean. I always set my timer for 12 minutes and start checking from there—ovens vary, so it’s better to watch closely than overbake. Let them cool completely on a wire rack before moving on.

Step 5: Make the Lime Curd Slime Filling

The magic to these cupcakes is that delicious lime curd “slime” surprise inside. Whip together fresh lime juice, zest, butter, sugar, and egg yolks over low heat until thickened. This takes patience—stir constantly to avoid curdling, and once thickened, cool completely. I always make extra because some of it mysteriously disappears before filling the cupcakes!

Step 6: Prepare the Electric Green Frosting

Beat room-temperature butter until creamy, then gradually add powdered sugar, lime juice, zest, vanilla, and salt. Add electric green gel food coloring until you get that perfect vivid green. The frosting should be thick enough to hold its shape but soft enough to pipe smoothly. If it’s too stiff, add a touch more lime juice; if too soft, a little extra powdered sugar helps. I love how this frosting looks like glowing slime once piped on!

Step 7: Assemble and Decorate with Fondant

Once cupcakes are cooled, hollow out a small center with a paring knife or cupcake corer and fill it with the lime curd slime. Pipe or spread the green frosting over each cupcake. Then use your fondant pieces to create Slimer’s big eyes, mischievous grin, and funny little teeth. I’ve found that rolling out the fondant thinly and cutting shapes with small cookie cutters or a sharp knife works best. If fondant feels tricky at first, placing a damp paper towel over unused pieces keeps them soft and workable.

How to Serve Slimer Ghostbusters Cupcakes Recipe

Garnishes

I like to keep the garnishes simple to let the Slimer design shine. A sprinkle of edible shimmer dust or a few tiny green sprinkles around the edges adds an extra pop without overshadowing the fondant details. Sometimes I add a small lime wedge on the side for extra flair and to hint at the tart lime flavor inside.

Side Dishes

These cupcakes are great on their own, but if you want to put together a fun Ghostbusters-themed spread, I pair them with fizzy lime sodas or ghostly white chocolate-dipped pretzels. Fresh fruit platters with green grapes and kiwi complement the lime flavors beautifully, too.

Creative Ways to Present

For Halloween parties or Ghostbusters movie nights, I’ve arranged these cupcakes on a black cake stand surrounded by green LED fairy lights—it gives a magical, glowing effect that thrills the kids and adults alike. You can also place them in slime-green cupcake liners or serve with themed napkins and straws to elevate the experience.

Make Ahead and Storage

Storing Leftovers

If you have any leftovers (rare in my house!), store the cupcakes in an airtight container in the fridge. The lime curd filling means they need to stay cool and keep their texture. They’ll be good for up to 3 days—just bring them to room temperature before serving for best flavor.

Freezing

I’ve frozen these cupcakes successfully by wrapping them tightly in plastic wrap and placing them in a freezer-safe container. Just freeze them before filling or frosting to avoid sogginess. When ready to eat, thaw overnight in the fridge and add frosting and filling fresh if possible.

Reheating

Since these cupcakes are best served cool due to the lime curd, I avoid reheating. Instead, I recommend serving chilled or at room temperature for the perfect balance of flavors and textures. If you want a warm cupcake experience, try heating just the cake without filling for a few seconds in the microwave before adding fresh frosting and filling.

FAQs

Final Thoughts

I have to say, making these Slimer Ghostbusters Cupcakes always turns into such a fun project—perfect for family gatherings, Halloween, or any time the Ghostbusters mood strikes. They look impressive but are surprisingly straightforward when you break it down. Honestly, I love the way the lime curd filling surprises everyone, and the bright green frosting just brings Slimer to life. Give this recipe a try, and I promise you’ll be smiling as much as I do watching friends bite into these playful, tangy treats. Happy baking!

Print