Description
These Slimer Ghostbusters Cupcakes are a fun and spooky treat featuring fluffy lime-flavored cupcakes filled with tangy lime curd ‘slime’ and topped with vibrant electric green buttercream frosting. Finished with creative fondant decorations, these cupcakes are perfect for Halloween parties or any Ghostbusters fan craving a deliciously eerie dessert.
Ingredients
Scale
Cupcake Batter
- 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)
Lime Curd Filling
- 3/4 cup granulated sugar (150g)
- 1/4 tsp fine salt (2g)
- 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
Buttercream 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 Cupcake Batter: In a large bowl, cream the unsalted butter and 3/4 cup granulated sugar together until light and fluffy. Add the 3 large eggs one at a time, beating well after each addition. Mix in the egg whites, sour cream, whole milk, lime juice, vanilla extract, and lime zest. Add green gel food coloring gradually until the batter reaches the desired vibrant green color. In a separate bowl, sift together the all-purpose flour, baking powder, and salt. Gradually add the dry ingredients to the wet ingredients, mixing just until combined to maintain a light texture.
- Bake Cupcakes: Preheat your oven to 350°F (175°C). Line a 12-cup cupcake pan with paper liners. Divide the batter evenly among the liners, filling each about two-thirds full. Bake for 15 minutes or until a toothpick inserted into the center comes out clean. Remove from oven and let cupcakes cool completely on a wire rack.
- Make Lime Curd Filling: In a saucepan, combine granulated sugar, salt, fresh lime juice, and lime zest. Heat over medium heat until sugar dissolves and mixture is warm. Remove from heat and gradually whisk in unsalted butter until melted and smooth. Add electric green gel food coloring to achieve a vivid slime-like color. Allow lime curd to cool to room temperature, then refrigerate until thickened enough to fill cupcakes.
- Fill Cupcakes: Once cupcakes are cooled, use a small knife or cupcake corer to remove a portion from the center of each cupcake. Fill the hollow with chilled lime curd ‘slime’ using a spoon or piping bag. Replace the cupcake tops or leave them open for better filling display.
- Prepare Buttercream Frosting: In a mixing bowl, beat the unsalted butter until creamy. Add lime juice, lime zest, vanilla extract, and salt; mix well. Gradually add powdered sugar, beating on low then high speed until smooth and fluffy. Add electric green gel food coloring until a bright, electric green shade is achieved.
- Frost Cupcakes: Using a piping bag fitted with your favorite tip or a spatula, frost each cupcake generously with the electric green buttercream. Aim for a slime-like swirl or dripping effect to complement the lime curd filling.
- Decorate with Fondant: Use the red, black, yellow, and white fondants to mold small Slimer eyes, mouth, and other iconic features. Attach them carefully to the top of the frosted cupcakes to resemble Slimer’s spooky yet playful face.
Notes
- These Ghostbusters-inspired Slimer cupcakes are made with fluffy lime cupcakes and a tangy lime curd slime filling that’s both spooky and delicious.
- Allow the cupcakes to cool fully before filling and frosting to prevent melting or slippage.
- The lime curd can be made a day ahead and stored refrigerated for convenience.
- Electric green gel food coloring ensures a vibrant, vivid color for that iconic Slimer look without affecting flavor.
- Fondant decorations can be prepared in advance and stored in an airtight container at room temperature.
- Store cupcakes in an airtight container in the refrigerator for up to 3 days; bring to room temperature before serving for best texture and flavor.
Nutrition
- Serving Size: 1 cupcake
- 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
