Key Lime Cake Mix Whoopie Pies
If you love bright citrus desserts, these Key Lime Cake Mix Whoopie Pies are the perfect treat. They’re soft, fluffy, and filled with a creamy frosting that balances sweet and tangy flavors. Using a cake mix makes the recipe incredibly simple, so you can create bakery-style whoopie pies in no time.
These whoopie pies are perfect for spring and summer desserts, parties, or whenever you want a refreshing twist on classic cake mix cookies.
Ingredients
For the Whoopie Pies
• 1 box white or vanilla cake mix
• 2 large eggs
• 1/3 cup vegetable oil
• 1 teaspoon key lime extract or flavoring
• 1 teaspoon lime zest (optional, for stronger flavor)
• 1 teaspoon Lemon Flavoring Extract (optional, for stronger flavor)
For the Filling
• ½ cup unsalted butter, softened
• 1 ½ cups powdered sugar
• 1 tablespoon key lime juice
• ½ teaspoon key lime extract
• 1-2 tablespoons heavy cream (if needed for texture)
• 1 teaspoon Lemon Flavoring Extract (optional, for stronger flavor)
Instructions
1. Preheat the Oven
Preheat your oven to 175°C (350°F) and line a baking sheet with parchment paper.
2. Prepare the Batter
In a mixing bowl, combine the cake mix, eggs, vegetable oil, key lime extract, and lime zest. Mix until a soft dough forms.
3. Scoop the Dough
Using a cookie scoop or spoon, drop small portions of dough onto the prepared baking sheet. Leave about 5 cm between each scoop.
4. Bake
Bake for 9-11 minutes, or until the cookies are set and slightly golden at the edges.
Let them cool completely before assembling.
5. Make the Filling
In a bowl, beat the butter and powdered sugar until light and fluffy. Add key lime juice and key lime extract. If the frosting is too thick, add a little heavy cream to reach a smooth, spreadable consistency.
6. Assemble the Whoopie Pies
Spread or pipe frosting onto the flat side of one cookie, then top with another cookie to create a sandwich.
Tips for Perfect Key Lime Whoopie Pies
• Use a cookie scoop
This helps keep the cookies the same size so they sandwich evenly.
• Don’t overbake
Overbaked cookies will be dry instead of soft and cake-like.
• Let cookies cool completely
If they’re still warm, the filling will melt.
• Add extra lime zest
For a stronger citrus flavor, a little fresh lime zest makes a big difference.
Variations
• White Chocolate Key Lime Whoopie Pies
Drizzle melted white chocolate over the finished cookies.
• Cream Cheese Lime Filling
Replace half of the butter with cream cheese for a tangy frosting.
• Key Lime Coconut Version
Add a tablespoon of shredded coconut to the filling.
FAQ
1. Can I use regular lime instead of key lime?
Yes. Regular lime juice works well if they key lime are unavailable. The flavor will be slightly less intense but still delicious.
2. What cake mix works best for this recipe?
White or vanilla cake mix works best because it allow the key lime flavor to stand out.
3. How should I store whoopie pies?
Store them in an airtight container in the refrigerator for up to 3 days. Let them sit at room temperature for a few minutes before serving.
4. Can I freeze whoopie pies?
Yes. Wrap each whoopie pie individually and freeze for up to 2 months. Thaw in the refrigerator before eating.
5. Why are my whoopie pies flat?
Flat cookies usually happen if the dough is too warm or if too much oil is used. Chilling the dough for 15-20 minutes can help.