Key Lime Cake Recipe Southern Living: Zesty Citrus Layers With Cream Cheese Frosting

There’s something undeniably special about a key lime cake that captures the essence of Southern charm. This recipe delivers bright citrus flavor balanced with rich, creamy frosting.

The secret lies in using fresh key lime juice for that authentic tang, while the cream cheese frosting adds a velvety finish. Each layer stays moist and tender, with just the right amount of zesty punch.

Baking this cake fills your kitchen with a warm, citrusy aroma that’s impossible to resist. The texture is light yet substantial, with a crumb that melts in your mouth.

Perfect for summer gatherings or when you need a taste of the tropics. This one deserves a spot in your recipe collection.

Ingredients for Key Lime Cake Recipe Southern Living

Bright citrus and creamy frosting come together in this crowd-pleasing Southern classic.

The limes are everything here. Fresh key lime juice (the tiny, tart kind, not regular limes) gives that authentic Florida flavor—Nellie & Joe’s bottled works in a pinch but fresh is incomparable. Look for key limes at Latin markets or Whole Foods in season. The buttermilk makes the crumb tender, so don’t substitute regular milk—Cultured buttermilk is what you want (or make your own with milk and vinegar).

No key limes? Regular lime juice plus a bit of extra zest gets you 80% there. Out of buttermilk? Plain yogurt thinned with milk works. For the frosting, Philadelphia cream cheese is the gold standard—full-fat only, no tubs. The powdered sugar gets a citrus boost from more zest, so don’t skip it. And that splash of cream in the frosting? Worth the extra minute for perfect consistency.

Cake layers keep at room temperature for 2 days (covered), or freeze unfrosted for 3 months. The frosting can be made ahead and refrigerated for 3 days—just rewhip before using. Leftovers? They won’t last long, but they’ll keep in the fridge for 5 days.

Step-by-Step Instructions for Key Lime Cake With Cream Cheese Frosting

Here’s the method I use for perfectly moist layers with that signature citrus zing.

Step 1: Prepare the Cake Batter

Preheat your oven to 350°F and grease and flour three 8-inch round cake pans. In a medium bowl, whisk together the 2.5 cups all-purpose flour, 1 tsp baking powder, 0.5 tsp baking soda, and 0.5 tsp salt. This ensures your dry ingredients are evenly distributed before mixing.

In a large bowl, cream the 1 cup unsalted butter with 1 ½ cups granulated sugar until light and fluffy—about 3-4 minutes. Add the 4 whole large eggs one at a time, beating well after each addition. Then mix in the 1 tsp vanilla extract, 0.5 cup fresh key lime juice, and 1 tbsp key lime zest.

Alternate adding the dry ingredients and the 1 cup buttermilk to the butter mixture, beginning and ending with the dry ingredients. Mix until just combined—overmixing will make your cake dense.

Step 2: Bake the Cake Layers

Divide the batter evenly among the prepared pans. Bake for 25-30 minutes, or until a toothpick inserted into the center of each layer comes out clean. I always start checking at 22 minutes to prevent overbaking.

The layers should be golden brown and spring back lightly when touched. If the tops domed significantly, use a serrated knife to level them while still warm. Cool the layers in the pans for 10 minutes, then transfer to a wire rack to cool completely.

Real talk: don’t rush the cooling process. Frosting warm layers will cause your cream cheese frosting to melt and slide right off.

Step 3: Make the Cream Cheese Frosting

In a large bowl, beat the 8 oz cream cheese until smooth and creamy. Gradually add the remaining ½ cup granulated sugar and beat until fully incorporated. This helps balance the sweetness and adds stability to your frosting.

With the mixer on low, gradually add the 4 cups powdered sugar, mixing until smooth and fluffy. Pour in the 0.25 cup heavy cream and beat for another 1-2 minutes until the frosting is light and spreadable.

Here’s the thing—if your frosting seems too thick, add a teaspoon of the reserved key lime juice. If it’s too thin, add a bit more powdered sugar. The texture should hold its shape when piped but still be easy to spread.

Step 4: Assemble and Frost the Cake

Place one cake layer on a serving plate and spread a generous layer of frosting over the top. Add the second layer and repeat, then top with the final layer. Spread a thin crumb coat of frosting over the entire cake to seal in any loose crumbs.

Refrigerate the cake for 15-20 minutes to set the crumb coat. This step prevents crumbs from showing up in your final frosting layer. Then, spread the remaining frosting evenly over the top and sides of the cake.

For a finishing touch, garnish with additional key lime zest or thin slices of lime. Let the cake sit at room temperature for 30 minutes before serving to allow the flavors to meld together.

Serving Suggestions for This Dish

Plating Perfection

For an elegant presentation, place the cake on a white cake stand to highlight its vibrant citrus color. I love using a cake turntable for smooth, even frosting application. The contrast between the bright green zest and creamy frosting is stunning. 💫

Garnish Ideas

Top with thin lime wheels or candied lime slices for a restaurant-worthy finish. A light dusting of powdered sugar adds a delicate touch. I also like adding edible gold leaf for special occasions.

Serving Temperature

This cake tastes best served slightly cool but not cold. Remove from the fridge 30 minutes before serving to let the flavors fully develop. The frosting will be perfectly spreadable and the cake layers moist.

Portion Suggestions

Cut into 12 equal slices for standard servings. For a dinner party, I often make slightly larger portions by cutting into 8 slices. Use a hot knife (dipped in hot water) for clean cuts.

Pairing Drinks

A chilled glass of Moscato or Sauvignon Blanc complements the citrus beautifully. For non-alcoholic options, sparkling limeade or iced tea with lemon works wonderfully. 🍷

Accompaniments

Serve with fresh berries like strawberries or raspberries for a pop of color and tartness. A dollop of whipped cream or a scoop of vanilla ice cream adds extra indulgence.

Frequently Asked Questions