If you’re a Ghostbusters fan or just love fun, flavorful cupcakes, you’re going to flip for my Slimer Ghostbusters Cupcakes Recipe. I promise these cupcakes are not only a showstopper with their vibrant green color and slime-inspired filling, but they also taste amazingly fresh and zesty thanks to the lime in the batter, curd, and frosting. Whether you’re baking for a themed party, Halloween, or just a weekend treat, this recipe is packed with flavor and personality that’ll have everyone asking for seconds.
Why You’ll Love This Recipe
- Perfect Balance of Zesty & Sweet: The lime brings a bright freshness that wakes up the cupcake, while the sweet frosting and curd keep it indulgent.
- Fun & Themed Presentation: You get that instantly recognizable Slimer green look with slime filling and adorable fondant decorations.
- Moist & Fluffy Texture: Thanks to sour cream and the right mix of fats, these cupcakes bake up light but wonderfully tender.
- Step-by-Step Friendly: I break down each part clearly so even if you’re not a pro baker, you’ll nail this!
Ingredients You’ll Need
One of the things I love about this Slimer Ghostbusters Cupcakes Recipe is how well these ingredients come together to create that iconic slime look without sacrificing flavor. Fresh lime juice and zest are the stars here, giving you authentic citrus brightness, while the butter and sour cream ensure the cupcakes stay soft and moist.
- Unsalted butter: Room temp butter is a must for creaming to get that light chewy crumb.
- Granulated sugar: Regular white sugar works best to balance the lime zest and juice.
- Egg whites and whole eggs: Using both helps with texture and structure.
- Full-fat sour cream: Adds moisture and a slight tang that lifts the lime flavors.
- Whole milk: Keeps the batter smooth and tender.
- Lime juice and zest: Fresh is critical here! The zest brings intense lime oils, and the juice adds brightness.
- Vanilla extract or bean paste: Just a touch to round out the citrus notes.
- Green gel food coloring: For that electric Slimer green hue without watering down the batter.
- All-purpose flour: Provides structure but not too much to dry things out.
- Baking powder: Helps the cupcakes rise perfectly.
- Fine salt: Balances all the sweetness and bright flavors.
- Fondant (red, black, yellow, white): For crafting Slimer’s goofy eyes and mouth – I love this finish for that cartoon cameo effect.
Variations
I’m all for tweaking recipes to suit your style — that’s part of the fun in baking! I like to add a little extra lime zest if I want my cupcakes to have an extra punch, but feel free to swap out lime for lemon for a twist. You can even make it dairy-free by using plant-based sour cream and milk substitutes.
- Dairy-Free Version: Use a vegan butter substitute and coconut or almond milk with plant-based sour cream to keep things moist without losing flavor.
- More Tart Filling: If you’re a fan of tang, increase the lime juice in the curd filling, or add a teaspoon of lime zest for texture.
- Chocolate Twist: Adding a teaspoon of cocoa powder to the batter gives a subtle twist without overwhelming the Slimer vibe.
- Fondant-Free: If fondant isn’t your thing, you can decorate with piped buttercream eyes and a playful mouth using food coloring and a small piping tip.
How to Make Slimer Ghostbusters Cupcakes Recipe
Step 1: Cream Butter and Sugar Until Fluffy
Start by beating your room temperature butter and granulated sugar in a stand mixer or bowl with a hand mixer. This step is crucial because properly creamed butter traps air that helps your cupcakes rise beautifully and stay light. Beat for about 3-5 minutes until it’s pale and fluffy – you’ll see the volume increase, which is a great sign!
Step 2: Incorporate Eggs and Wet Ingredients
Next, add in your room temperature egg whites one at a time, mixing well between additions. Then, carefully pour in sour cream, whole milk, lime juice, vanilla, and lime zest. I use a spatula here to fold gently to keep that airiness intact. Stir in your green gel food coloring a few drops at a time until you reach the signature electric Slimer green.
Step 3: Mix Dry Ingredients Separately and Combine
In a separate bowl, whisk together the all-purpose flour, baking powder, and salt. Then, slowly add the dry ingredients to the wet mixture, mixing just until combined. Overmixing here can toughen your cupcakes, so stop as soon as you don’t see streaks of flour.
Step 4: Bake and Test for Doneness
Dollop the batter into lined cupcake tins, filling about 2/3 full. Bake at 350°F (175°C) for around 14-16 minutes. I always check with a toothpick poked in the center – it should come out clean or with just a few moist crumbs. Remove and let them cool completely before assembling.
Step 5: Prepare the Lime Curd Slime Filling
This silky lime curd is the soul of your Slimer cupcakes. I like to make this filling while cupcakes bake. Use fresh lime juice, zest, sugar, and butter, heating gently until smooth and thickened. Spread or pipe inside the center of each cupcake for that oozy slime effect. It’s amazing how this tangy surprise really amps up the fun and flavor.
Step 6: Whip Up the Electric Green Frosting
I combine softened butter, powdered sugar, lime juice, lime zest, vanilla, and a dash of salt, then beat until fluffy. Add just enough green gel food coloring to get that vibrant Slimer tone without it looking artificial. I love how this creamy frosting complements the zesty cupcake and tangy filling perfectly.
Step 7: Assemble and Decorate with Fondant
Once cupcakes have cooled, core out a small hole to fill with lime curd. Then frost generously with the green buttercream. Finally, use small pieces of red, black, yellow, and white fondant to craft Slimer’s goofy eyes and mischievous mouth — this part is where your cupcakes really come alive and stand out. My family goes crazy for these character details every time!
Pro Tips for Making Slimer Ghostbusters Cupcakes Recipe
- Use Room Temperature Ingredients: I learned this the hard way—cold eggs or butter can ruin the batter’s texture and cause uneven rising.
- Don’t Overmix the Batter: Gently fold dry ingredients to keep your cupcakes tender and soft rather than dense.
- Adjust Food Coloring Gradually: Be cautious adding green gel—it’s potent, so add a drop at a time to avoid that neon, artificial look.
- Cool Completely Before Filling and Frosting: I once rushed this step and the filling melted, so patience really pays off.
How to Serve Slimer Ghostbusters Cupcakes Recipe
Garnishes
I love adding just a tiny sprinkle of lime zest on top of the frosting for an extra citrus pop and a little shimmer of edible glitter to make the slime effect sparkle under the light—it’s like Slimer really came to life on my platter!
Side Dishes
For a Halloween bash or Ghostbusters movie night, I pair these cupcakes with classic popcorn tossed in lime zest and chili powder or a simple fruit platter with kiwi and green grapes to complement the lime theme.
Creative Ways to Present
In past parties, I’ve displayed these cupcakes on green-tinted cake stands with green and white striped straws and mini ghost figurines for a playful scene. You can also create a “slime pool” effect by piping extra lime curd around the base or swirling a little green gel icing on the serving plate for dramatic effect.
Make Ahead and Storage
Storing Leftovers
I keep leftover cupcakes in an airtight container in the fridge for up to 3 days. The lime curd is perishable, so refrigeration is essential. When stored right, they still taste fantastic because the frosting and filling stay fresh and creamy.
Freezing
For longer storage, I freeze unfrosted cupcakes wrapped tightly in plastic wrap and then foil, up to 2 months. Thaw overnight in the fridge before filling and frosting. I’ve found this method keeps the texture intact better than freezing after fully assembled.
Reheating
When ready to eat leftovers, I bring refrigerated cupcakes to room temperature for about 30 minutes before serving. Avoid microwave reheating to keep the frosting and filling from melting or separating.
FAQs
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Can I make the lime curd filling ahead of time?
Absolutely! The lime curd can be made up to 3 days ahead and stored in the fridge. Just bring it to room temperature and stir before filling your cupcakes to keep that silky texture.
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What if I don’t have green gel food coloring?
You can use regular liquid food coloring, but gel colors give a more vibrant shade without diluting your batter or frosting. Alternatively, natural coloring from spinach juice can be experimented with, but it may slightly affect flavor.
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Can I skip the fondant decorations?
Yes! If fondant isn’t your thing, try decorating with piped buttercream or edible markers on fondant sheets. The Slimer vibe is all about having fun, so be creative.
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How do I prevent cupcakes from drying out?
Using sour cream and milk in the batter really helps keep moisture. Also, avoid overbaking by checking with a toothpick a minute or two before time is up to ensure they’re just done.
Final Thoughts
I absolutely love how this Slimer Ghostbusters Cupcakes Recipe turns out every time — it’s a perfect balance of spooky fun and incredible flavor. From the lime-scented cupcakes to the oozy lime curd filling and playful fondant faces, it’s the kind of recipe that makes baking feel like magic. Whether you’re baking with kids or impressing friends, give this one a shot. I’m betting you’ll end up a Slimer fan for life, just like me!
Print
Slimer Ghostbusters Cupcakes Recipe
- Prep Time: 30 min
- Cook Time: 15 min
- Total Time: 75 min
- Yield: 12 cupcakes
- Category: Dessert
- Method: Baking
- Cuisine: American
Description
These Slimer Ghostbusters Cupcakes are a fun and delicious treat featuring fluffy lime cupcakes filled with a tangy lime curd slime filling and topped with vibrant electric green frosting. Inspired by the iconic Ghostbusters character Slimer, these cupcakes combine bright citrus flavors with a spooky, playful presentation perfect for themed parties or Halloween celebrations.
Ingredients
Cupcakes
- 6 Tbsp (3/4 stick) unsalted butter, room temperature (85g)
- 3/4 cup granulated sugar (150g)
- 1/3 cup carton egg whites or 3 large egg whites, room temperature (90g)
- 1/3 cup full-fat sour cream, room temperature (80g)
- 1/3 cup whole milk, room temperature (80g)
- 1/4 cup lime juice (60g)
- 1 tsp vanilla extract or vanilla bean paste (4g)
- 2 tsp lime zest (4g)
- green gel food coloring
- 1 1/4 cups all-purpose flour (165g)
- 2 tsp baking powder (8g)
- 1/4 tsp fine salt (2g)
- 3 large eggs, room temperature (168g)
- 3/4 cup granulated sugar (150g)
- 1/4 tsp fine salt (2g)
Lime Curd Slime Filling
- 1/2 cup fresh lime juice (120g)
- 1 Tbsp lime zest (6g)
- 6 Tbsp (3/4 stick) unsalted butter, room temperature (85g)
- electric green gel food coloring
Frosting
- 1 cup unsalted butter, room temperature (226g)
- 2 Tbsp lime juice (12g)
- 1 tsp lime zest (2g)
- 1 tsp vanilla extract or vanilla bean paste (4g)
- 1/2 tsp fine salt (3g)
- 3 1/2 cups powdered sugar (452g or 1 lb. box)
- electric green gel food coloring
Decorations
- 1/4 cup red fondant
- 1/4 cup black fondant
- 1 Tbsp yellow fondant
- 1 Tbsp white fondant
Instructions
- Prepare the Cupcake Batter: In a large bowl, cream together the 6 tablespoons unsalted butter and 3/4 cup granulated sugar until light and fluffy. Add the 1/3 cup egg whites, 1/3 cup sour cream, 1/3 cup whole milk, 1/4 cup lime juice, vanilla extract, lime zest, and green gel food coloring. Mix until fully combined.
- Combine Dry Ingredients: In a separate bowl, sift together the all-purpose flour, baking powder, and 1/4 teaspoon salt. Gradually add the dry ingredients to the wet mixture, stirring until just combined.
- Whip Eggs and Sugar: In another bowl, beat the 3 large eggs with 3/4 cup granulated sugar and 1/4 teaspoon salt until pale and fluffy. Gently fold this egg mixture into the cupcake batter to lighten the texture.
- Bake the Cupcakes: Preheat the oven to 350°F (175°C). Line a cupcake pan with liners, then divide the batter evenly among 12 cups. Bake for 15 minutes or until a toothpick inserted into the center comes out clean. Let cool completely before filling.
- Make the Lime Curd Slime Filling: In a saucepan over low heat, combine the lime juice, lime zest, and butter. Stir continuously until the butter melts and the mixture thickens slightly. Add electric green gel food coloring to achieve a slime-like vibrant color. Allow to cool to room temperature.
- Fill the Cupcakes: Using a small knife or cupcake corer, carefully remove the center of each cooled cupcake and fill with the lime curd slime filling. Replace the removed cake piece on top to seal.
- Prepare the Frosting: In a large bowl, beat the unsalted butter until creamy. Add the lime juice, lime zest, vanilla extract, fine salt, and electric green gel food coloring. Gradually add the powdered sugar and beat until frosting is light and fluffy.
- Frost the Cupcakes: Pipe or spread the electric green frosting generously over each cupcake to create a gooey, slime-like appearance reminiscent of Slimer.
- Create Fondant Decorations: Use the red, black, yellow, and white fondant to shape small decorations that resemble Slimer’s eyes, mouth, and other facial features. Place these on top of the frosted cupcakes for a fun and spooky finishing touch.
Notes
- These Ghostbusters-inspired Slimer cupcakes are made with fluffy lime cupcakes and tangy lime curd slime filling for a spooky and delicious treat.
- Ensure all ingredients are at room temperature for best mixing results and texture.
- The green gel food coloring helps achieve the signature slime color, use sparingly until desired shade is achieved.
- Fondant decorations can be made ahead of time and stored in an airtight container until ready to use.
- Store cupcakes in an airtight container in the refrigerator and bring to room temperature before serving for optimal flavor.
Nutrition
- Serving Size: 1 cupcake (approx. 100g)
- Calories: 556 kcal
- Sugar: 58 g
- Sodium: 417 mg
- Fat: 30 g
- Saturated Fat: 18 g
- Unsaturated Fat: 10 g
- Trans Fat: 1 g
- Carbohydrates: 70 g
- Fiber: 1 g
- Protein: 5 g
- Cholesterol: 122 mg
