Description
These Slimer Ghostbusters Cupcakes are a fun and spooky treat featuring fluffy lime-flavored cupcakes filled with zesty lime curd ‘slime’ and topped with electric green lime buttercream frosting. Perfect for Halloween or Ghostbusters fans, each cupcake is decorated with playful fondant details to bring the iconic ghost character to life in a delicious way.
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, as needed
- 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 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, as needed
Lime 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, as needed
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 mixing bowl, cream together 6 Tbsp of unsalted butter and 3/4 cup sugar until light and fluffy. Add 3 large eggs one at a time, beating well after each addition. In a separate bowl, whisk together 1 1/4 cups all-purpose flour, 2 tsp baking powder, and 1/4 tsp fine salt. Alternately add the dry ingredients and the wet ingredients—1/3 cup egg whites, 1/3 cup sour cream, 1/3 cup whole milk, 1/4 cup lime juice, 1 tsp vanilla extract, 2 tsp lime zest, and green gel food coloring—to the butter mixture, starting and ending with the dry ingredients. Mix just until combined.
- Bake the Cupcakes: Preheat the oven to 350°F (175°C). Line a 12-cup muffin tin with cupcake liners. Divide the batter evenly among the liners, filling each about two-thirds full. Bake for approximately 15 minutes, or until a toothpick inserted in the center comes out clean. Remove from oven and allow to cool completely on a wire rack.
- Make the Lime Curd Filling: In a medium saucepan over low heat, combine 1/2 cup fresh lime juice, 1 Tbsp lime zest, and 6 Tbsp unsalted butter. Stir continuously until the butter melts and the mixture thickens slightly. Add electric green gel food coloring to achieve a vibrant ‘slime’ color. Remove from heat and let cool to room temperature, then refrigerate until set but still soft enough to fill cupcakes.
- Prepare the Lime Buttercream Frosting: In a large bowl, beat 1 cup unsalted butter with an electric mixer until creamy. Gradually add 3 1/2 cups powdered sugar, beating well after each addition. Mix in 2 Tbsp lime juice, 1 tsp lime zest, 1 tsp vanilla extract, 1/2 tsp fine salt, and electric green gel food coloring to reach the desired vibrant green shade. Continue beating until fluffy.
- Assemble the Cupcakes: Using a cupcake corer or a small knife, carefully remove the center of each cooled cupcake. Fill each cavity with a spoonful of lime curd ‘slime’ filling. Replace the top part of the cupcake or leave the opening as is for visual effect. Pipe or spread the lime buttercream frosting generously over the cupcakes.
- Decorate with Fondant: Roll out red, black, yellow, and white fondant to create small shapes and features resembling Slimer from Ghostbusters. Use these fondant decorations to adorn the tops of the cupcakes, giving them a playful and spooky character appearance.
- Serve and Enjoy: Allow the decorated cupcakes to set at room temperature for about 10–15 minutes before serving to let the frosting firm up slightly. These cupcakes are perfect for Halloween parties or Ghostbusters-themed events.
Notes
- These Ghostbusters-inspired Slimer cupcakes feature fluffy lime cupcakes with a tart lime curd filling, creating a fun and spooky ‘slime’ effect inside.
- Use gel food coloring for vibrant and natural-looking green frosting; liquid food coloring may thin the frosting.
- Make sure all dairy ingredients are at room temperature to ensure smooth batter and frosting.
- Fondant decorations can be prepared ahead of time and stored in an airtight container until use.
- For best flavor, allow cupcakes to rest overnight for the lime curd filling to meld into the cake.
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
