Key Lime Cupcakes
If you love bright, citrusy desserts that aren’t overly sweet, these Key Lime Cupcakes are for you. They’re soft, fluffy, and packed with fresh lime flavor, all topped with a luscious cream cheese frosting that ties everything together perfectly!
These cupcakes are tender, moist, and perfectly tangy, with bright citrus flavor in every bite. The subtle lime zest and juice in the batter make them taste like mini key lime pies. Topped with a creamy key lime cream cheese frosting, they’re a refreshing and festive treat for any occasion. Perfect for summer parties, birthdays, or just a little sweet citrus indulgence.
Key lime pie has always been one of my favorite desserts, and these cupcakes are my way of turning that classic flavor into something a little more playful and easy to share. They have the same tangy, refreshing bite you expect from key lime pie, just baked into a tender cupcake instead of a slice!
The secret to the perfect key lime pie cupcakes is using enough lime to really taste it, but not so much that it overwhelms the cake. The cream cheese frosting is smooth, slightly tangy, and not too sweet, making it the perfect match for the lime cupcakes underneath. They feel familiar and just fancy enough for a special occasion without being fussy!
Ingredient Notes
- All-purpose flour: Provides structure while keeping the cupcakes soft and tender. Measure carefully to avoid dense cupcakes!
- Baking powder & baking soda: This combination helps the cupcakes rise properly and stay light. The baking soda also reacts with the acidity of the lime juice.
- Unsalted butter: Adds richness and flavor to both the cupcakes and frosting. Make sure it’s fully softened for smooth mixing.
- Granulated sugar: Sweetens the cupcakes while keeping the crumb light.
- Eggs: Help bind the batter and add moisture.
- Vanilla extract: Enhances the overall flavor!
- Key lime juice: Brings that signature tart, citrusy flavor. Fresh juice is best if you can find it.
- Key lime zest: Adds concentrated lime flavor and aroma that juice alone can’t provide.
- Whole milk: Keeps the cupcakes moist and tender.
- Cream cheese: The base of the frosting, adding tang and richness. Use full-fat block cream cheese for the best texture.
- Powdered sugar: Sweetens and thickens the frosting for a smooth, pipeable consistency.
- Salt: Just a pinch to balance out the frosting!
What are key limes?
Key limes are smaller, more aromatic, and more tart than regular Persian limes. They’re traditionally used in key lime pie and have a distinct, bright citrus flavor that’s slightly more floral and intense.
Substitutions
If you can’t find key limes, regular limes work well as a substitute, though the flavor will be slightly less sharp. You can also use bottled key lime juice, and use regular limes for the lime zest.
For a lighter frosting, you can reduce the powdered sugar slightly for a softer, less sweet finish. If you prefer a stronger lime flavor, add a bit more zest rather than extra juice to avoid altering the texture.
Tips for the Best Key Lime Cupcakes
- Use room-temperature ingredients. Softened butter, cream cheese, eggs, and milk blend together more smoothly, creating a better cupcake texture. Cold ingredients can cause the batter to mix unevenly.
- Don’t overmix the batter. Once the dry ingredients are added, mix just until combined. Overmixing can lead to dense or tough cupcakes.
- Zest before you juice. It’s much easier to zest whole limes than juiced ones, and you’ll get more flavorful zest this way. Use only the green part of the lime peel – the white pith can be bitter. The zest adds essential lime flavor without extra liquid.
- Check doneness early. Small cupcakes bake quickly; start checking at 15 minutes.
- Cool completely before frosting. Even slightly warm cupcakes can cause the frosting to melt and slide off. Let them cool fully for clean, beautiful frosting!
- Chill the frosting if needed. If the frosting feels too soft to pipe, a short chill in the fridge helps it firm up without affecting the flavor.
- Optional garnish. Sprinkle crushed graham crackers on top of the frosting for a pie-like touch.
Adjusting for the Differences in Cream Cheese outside of the US
If you live outside of the US, it is sometimes harder to find the classic American style firm cream cheese sold in blocks. In Europe and some Latin American countries you are more likely to find a softer spreadable cream cheese, usually sold in tubs instead of in the block form. I´ve tested and perfected making a cream cheese frosting that works with this softer type of cream cheese. The secret is to use less butter and less powdered sugar. Instructions for preparing this variation of the frosting are included below the Recipe Notes section.
Key Lime Cupcake variations to try
- Mini Key Lime Cupcakes: Use mini liners; bake for 10–12 minutes.
- Lemon-Lime Twist: Add 1 tsp lemon zest along with lime for a citrus punch.
- Coconut Key Lime: Fold in 2 Tbsp sweetened shredded coconut to the batter.
- Filled Cupcakes: Pipe in a spoonful of lime curd or cream cheese center after baking.
Storage Suggestions
Store frosted key lime cupcakes in an airtight container in the refrigerator for up to 4 days. Let them sit at room temperature for about 20 minutes before serving for the best texture and flavor.
Unfrosted cupcakes can be stored at room temperature for one day or frozen for up to 2 months. Thaw completely before frosting and serving.
Frequently Asked Questions
Can I make these without buttermilk?
Yes! Using milk + lime juice creates enough acidity to tenderize the cupcakes, giving a similar texture to buttermilk.
Can I use bottled key lime juice?
Fresh key lime juice is recommended for the best flavor, but bottled juice will work in a pinch. Just make sure it’s 100% juice with no added sweeteners.
Are key lime pie cupcakes very tart?
They’re bright and citrusy but balanced by the sweetness of the cake and frosting. The cream cheese frosting helps mellow the tartness beautifully.
Can I make these cupcakes ahead of time?
Yes, you can bake the cupcakes a day in advance and store them unfrosted. Frost them the day you plan to serve for the freshest result!
Key Lime Cupcakes
Ingredients
For the cupcakes:
- 1 ¼ cups all-purpose flour 1 ¼ cups flour=150g
- 1 ¼ tsp baking powder
- ¼ tsp baking soda
- ¼ tsp salt
- ½ cup unsalted butter, softened ½ cup butter=115g
- ¾ cup granulated sugar ¾ cup sugar =150g
- 2 large eggs
- 1 ½ tsp vanilla extract
- 2 Tbsp key lime juice fresh if possible
- 1 Tbsp key lime zest
- ½ cup whole milk ½ cup milk =120ml
For the cream cheese frosting*:
- ½ cup unsalted butter, softened ½ cup butter=115g
- 8 oz firm cream cheese in block form, softened 8 oz cream cheese=226g – if you only have European style soft cream cheese use the quantities listed in the Notes below
- 3 ½ cups powdered sugar, sifted 3 ½ cups powdered sugar=420g
- 1 Tbsp key lime juice
- 1 tsp key lime zest
- Pinch of salt
To decorate/garnish:
- Lime zest
- Mini-lime wedges or slices
Instructions
For the cupcakes:
- Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with liners.
- In a small bowl, whisk together flour, baking powder, baking soda, and salt.
- In a medium bowl, beat butter and sugar until light and fluffy (2–3 minutes).
- Add eggs one at a time, mixing well after each. Stir in vanilla, lime juice, and zest.
- Add dry ingredients (flour mix) in two additions, alternating with milk. Mix gently until just combined.
- Divide batter evenly between cupcake liners (about 2/3 full).
- Bake 16–18 minutes, or until a toothpick inserted in the center comes out clean.
- Cool completely before frosting.
For the frosting:
- Beat butter and cream cheese together until smooth and fluffy.
- Add powdered sugar gradually, mixing on low speed.
- Mix in lime juice, zest, and salt. Beat until creamy and pipeable. (If too soft, chill for 15 minutes before piping.)
- Decorate the cupcakes with the frosting using a piping bag and star tip.
- Add some lime zest and mini-lime wedges to garnish.
Notes
- 60 grams of butter, softened
- 300 grams (10 ounces) tub of soft cream cheese
- 60 grams of powdered sugar
- Key lime zest and juice as indicated above
Photos of the step by step preparation process for Key Lime Cupcakes:
More Dessert Recipes to Try
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