Key lime cake brings together the perfect balance of tangy and sweet flavors, creating a delightful dessert that feels light and refreshing. With its zesty lime flavor, moist texture, and creamy frosting, it’s an ideal cake for any occasion, from summer picnics to family gatherings. Let’s dive into how to make the ultimate key lime cake, ensuring it’s bursting with bright citrus flavor and a soft, tender crumb.
Why Make Key Lime Cake?
This key lime cake offers a refreshing twist on traditional cakes. The tangy citrus flavor from fresh key limes, combined with the sweetness of a moist cake base, creates an irresistible dessert. Whether you love the classic key lime pie or want something with a similar flavor profile but a different texture, this cake delivers. Plus, the cake’s light, fluffy structure makes it perfect for warm-weather treats or any time you crave something fresh and fruity.
Ingredients You’ll Need
To create this delicious key lime cake, gather the following ingredients:
For the Cake:
- 2 cups all-purpose flour
- 1 1/2 cups granulated sugar
- 1/2 cup unsalted butter, softened
- 1/2 cup vegetable oil
- 3 large eggs
- 1 cup buttermilk
- 1/4 cup fresh key lime juice
- 1 tablespoon lime zest
- 1 teaspoon baking powder
- 1/2 teaspoon baking soda
- 1/2 teaspoon salt
- 1 teaspoon vanilla extract
For the Frosting:
- 8 ounces cream cheese, softened
- 1/2 cup unsalted butter, softened
- 4 cups powdered sugar
- 1/4 cup fresh key lime juice
- 1 teaspoon lime zest
- 1 teaspoon vanilla extract
Step-by-Step Instructions
1. Prepare the Cake Batter
Start by preheating your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans or line them with parchment paper to prevent the cake from sticking. Set the pans aside.
In a large mixing bowl, beat the softened butter, vegetable oil, and granulated sugar together until the mixture is light and fluffy. Use a hand mixer or stand mixer for about 2-3 minutes to achieve a smooth texture. Begin by adding the eggs to the butter mixture one at a time, ensuring each egg is fully incorporated before adding the next. Stir in the fragrant vanilla extract, letting its aroma blend into the mix. In a separate bowl, whisk together the flour, baking powder, baking soda, and a pinch of salt to combine. Gradually add this dry mixture to the butter mixture, alternating with the buttermilk. Start with the dry ingredients, mixing gently until everything is just blended. Avoid overmixing, as this can make the cake dense.
Stir in the fresh key lime juice and lime zest until the batter is smooth and well incorporated. The lime juice adds a tangy flavor, while the zest enhances the citrus aroma, giving the cake its signature bright taste.
2. Bake the Cake
Divide the batter evenly between the prepared cake pans, using a spatula to smooth the tops for an even rise. Place the pans in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. Once done, remove the cakes from the oven and allow them to cool in the pans for around 10 minutes. Then, gently transfer the cakes to a wire rack to cool completely before frosting. This cooling step is crucial, as frosting a warm cake will cause the frosting to melt.
3. Prepare the Lime Cream Cheese Frosting
While the cakes cool, make the frosting. In a large mixing bowl, beat the softened cream cheese and butter until it becomes creamy. Add the fresh key lime juice, lime zest, and vanilla extract. Gradually sift in the powdered sugar, mixing well until you reach a smooth and spreadable consistency.
The key lime juice gives the frosting a tangy flavor that complements the sweetness of the powdered sugar. Taste the frosting and adjust the lime juice if you prefer a more intense citrus flavor.
4. Assemble the Cake
Once the cake has cooled completely , it’s time to assemble. Place the first cake layer on a cake stand or serving plate. Spread a generous amount of lime cream cheese frosting on top, smoothing it out with an offset spatula.
Carefully place the second cake layer on top, ensuring it’s level. Apply a layer of frosting over the entire cake as a crumb coat. This layer seals in the crumbs, making it easier to apply the final coat of frosting.
After the crumb coat, add the remaining frosting, spreading it evenly over the top and sides of the cake. Smooth out the frosting for a clean finish, or use a swirling motion for a textured look. Garnish the top with extra lime zest or thin slices of lime for a decorative touch.
5. Chill the Cake (Optional)
For the best flavor and texture, chill the cake in the refrigerator for about 30 minutes before serving. Chilling allows the frosting to set, making it easier to slice. This step also enhances the tangy flavor of the lime.
Tips for the Best Key Lime Cake
- Use Fresh Key Limes: Fresh key lime juice and zest provide the best flavor. While bottled lime juice may work in a pinch, the fresh zest makes a significant difference in taste and aroma.
- Don’t Overmix the Batter: Mix the batter until the ingredients are just combined.
- Soften Ingredients Ahead: Ensure the butter and cream cheese are fully softened before mixing. Softened ingredients create a smooth batter and frosting, making the cake light and easy to frost.
Variations to Try
1. Coconut Key Lime Cake
For a tropical flair, fold shredded coconut into the batter. The coconut pairs beautifully with the lime, creating a cake that feels like a vacation in every bite. You can also sprinkle toasted coconut on top of the frosting for added texture and flavor.
2. Key Lime Pound Cake
For a denser version, use the same ingredients but bake in a loaf pan. Adjust the cooking time to about 50-60 minutes, or until a toothpick inserted in the center comes out clean. This variation works well for a brunch or afternoon tea.
3. Gluten-Free Key Lime Cake
Swap the all-purpose flour with a gluten-free flour blend. Make sure it includes xanthan gum for structure, as this helps the cake hold together. Follow the same steps for mixing and baking, and you’ll have a delicious gluten-free option.
Why This Cake Recipe Works Perfectly
This key lime cake uses a combination of butter and vegetable oil, providing both flavor and moisture. The buttermilk adds acidity, which reacts with the baking soda to create a light and fluffy texture. Fresh lime juice and zest give the cake its signature tart flavor, while the creamy frosting balances it with a touch of sweetness. Each element works together to create a balanced, flavorful dessert.
Pairing Suggestions for Key Lime Cake
- Fresh Berries: Serve the cake with fresh raspberries, blueberries, or strawberries. The sweetness of the berries complements the tangy lime flavor.
- Vanilla Ice Cream: A scoop of vanilla ice cream on the side adds a creamy, cool contrast to the zesty cake.
- Mint Garnish: Add fresh mint leaves as a garnish for an extra burst of freshness. Mint pairs wonderfully with lime, enhancing the overall citrus flavor.
Enjoy Your Key Lime Cake!
Key lime cake is the perfect dessert for anyone who loves bright, citrusy flavors and a moist, tender crumb. Whether you make it for a special occasion or a simple treat, this cake delivers freshness and sweetness in every bite. Experiment with variations or keep it classic—either way, you’ll have a delicious cake that’s sure to impress!