Irresistible Key Lime Cake with Key Lime Cream Cheese Frosting: A Zesty, Sweet Southern Classic

If you’re looking for a dessert that’s both refreshing and indulgent, look no further than this Key Lime Cake with Key Lime Cream Cheese Frosting. This citrus-forward treat brings together the tangy brightness of key limes, the richness of a buttery cake, and the creamy decadence of cream cheese frosting, all in one unforgettable bite. Perfect for spring and summer gatherings, birthdays, or just because you deserve something amazing, this cake is a must-bake for anyone who loves vibrant flavors and melt-in-your-mouth textures.

Why You’ll Love This Key Lime Cake

This cake captures everything we love about key lime pie—that zingy citrus flavor—wrapped inside a soft, moist layer cake and topped with a luxuriously tangy frosting. It’s light, flavorful, and delivers a satisfying balance of sweetness and acidity that keeps you coming back for more.

Ingredients & Their Purpose

For the Key Lime Cake:

2 ½ cups (315g) all-purpose flour
Forms the structure of the cake, providing a stable base to hold all the moisture and flavor.
2 ½ teaspoons baking powder
Leavens the cake, helping it rise into fluffy layers.
½ teaspoon baking soda
Works alongside the acidic key lime juice to create an airy texture.
½ teaspoon salt
Enhances flavor and balances the sweetness.
1 cup (226g) unsalted butter, softened
Adds rich flavor and a tender crumb through creaming with sugar.
2 cups (400g) granulated sugar
Sweetens the cake and helps aerate the batter when creamed with butter.
4 large eggs
Provide structure and stability while enriching the flavor and texture.
1 tablespoon key lime zest
Delivers intense citrus aroma and flavor from the essential oils in the zest.
¼ cup (60ml) key lime juice
Gives the cake its signature tangy taste and reacts with baking soda for leavening.
1 teaspoon vanilla extract
Adds warmth and depth to balance the citrus.
1 cup (240ml) buttermilk
Makes the cake incredibly moist and works with baking soda for lift.

For the Key Lime Cream Cheese Frosting:

8 oz (226g) cream cheese, softened
Adds tanginess and creaminess, the perfect complement to the key lime.
½ cup (113g) unsalted butter, softened
Contributes richness and helps whip the frosting into a spreadable consistency.
4 cups (480g) powdered sugar
Sweetens and thickens the frosting to a fluffy, smooth texture.
1 teaspoon vanilla extract
Rounds out the tangy and sweet notes with subtle warmth.
2 tablespoons key lime juice
Brings sharp citrus flavor that cuts through the sweetness.
1 teaspoon key lime zest
Intensifies the lime aroma for a fresh, zesty finish.

Step-by-Step Instructions

Step 1: Prepare the Key Lime Cake

Preheat your oven to 350°F (175°C). Grease and flour two 9-inch cake pans, or line them with parchment paper.
In a medium mixing bowl, whisk together the dry ingredients: flour, baking powder, baking soda, and salt. Set aside.
In a large bowl, cream the butter and sugar using a hand or stand mixer on medium speed until light and fluffy—about 3 minutes. This step ensures a soft, airy cake.
Add eggs one at a time, beating well after each. Mix in the vanilla extract, key lime zest, and key lime juice.
With the mixer on low, alternate adding the flour mixture and buttermilk, beginning and ending with the flour. Mix just until combined—do not overmix.
Divide the batter evenly between the prepared pans. Smooth the tops with a spatula.
Bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean.
Cool the cakes in the pans for 10 minutes before turning out onto a wire rack to cool completely.

Step 2: Make the Key Lime Cream Cheese Frosting

In a large bowl, beat cream cheese and butter together until smooth and creamy—about 2 minutes.
Gradually add powdered sugar, one cup at a time, mixing until fully incorporated and smooth.
Stir in the vanilla extract, key lime juice, and zest. Beat until light and fluffy. If too soft, chill for 15–20 minutes before using.

Step 3: Assemble and Decorate

Place one cake layer on a serving plate or cake stand. Spread a generous layer of frosting on top.
Add the second cake layer and apply a thin crumb coat over the entire cake. Chill for 15 minutes.
Apply the remaining frosting smoothly over the top and sides.
Garnish with extra key lime zest, lime slices, or candied lime peel for a professional finish.

Why Everyone Raves About This Recipe

Bright and tangy flavor: The use of real key lime juice and zest creates a citrus punch that’s unbeatable.
Perfectly balanced: Creamy frosting softens the tartness of the cake for a delightful mouthfeel.
Moist and tender crumb: Thanks to the buttermilk and butter combo.
Great for any occasion: Whether it’s a summer cookout or a holiday dessert, this cake shines.

Pro Tips for Success

Use fresh key limes for the most authentic flavor. Bottled juice works in a pinch, but zest from fresh limes is essential.
Room temperature ingredients mix better and create a smoother batter.
Don’t overmix the batter—just until combined to keep the cake soft and airy.
Chill the frosting briefly if it’s too soft to spread easily.
Make ahead: You can bake the cake layers a day in advance and refrigerate or freeze them until ready to assemble.

Serving Suggestions

Pair this Key Lime Cake with:

A tall glass of iced tea or a sparkling limeade
A scoop of vanilla bean ice cream
A dollop of whipped cream for extra decadence

This cake also makes a perfect ending to a meal of grilled seafood, tacos, or a light summer salad—adding a sweet and citrusy finale.

Final Thoughts: A Cake That’s Simple, Elegant, and Packed with Flavor

This Key Lime Cake with Key Lime Cream Cheese Frosting is a show-stopping dessert that tastes as good as it looks. It’s easy enough for beginners, yet impressive enough for special occasions. With its moist texture, vibrant lime flavor, and creamy frosting, it’s bound to become a go-to recipe in your collection.

Looking for a citrus dessert that truly delivers? This is it. Simple to make, bursting with flavor, and always a crowd-pleaser—this is the best Key Lime Cake recipe you’ll find online.

Ready to impress? Bookmark this recipe, share it with friends, and bake your way into their hearts—one zesty slice at a time. 🍰💚