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

This elegant cake brings bright, tropical flavor to any dessert table with its perfect balance of tart and sweet.

The secret lies in using fresh key lime juice and zest, which creates that signature citrus punch. The layers stay moist and tender, while the cream cheese frosting adds a rich, tangy finish that complements the lime beautifully.

Baking each layer at 350°F ensures even cooking and a golden crust. The frosting comes together quickly with just a few ingredients, making assembly straightforward.

Serve chilled for the best texture and flavor. This cake is ideal for celebrations or whenever you crave a taste of the tropics.

Ingredients for Key Lime Cake Recipe Southern Living

Bright citrus meets rich cream cheese in this showstopping tropical dessert.

The key limes are non-negotiable here. Look for the small, yellow-green limes—regular limes won’t give the right flavor. Publix or Winn-Dixie in the South often carry them fresh, but bottled Nellie & Joe’s works in a pinch (just use a little less). The buttermilk should be thick and tangy—Cultured buttermilk is the gold standard. Room temperature ingredients mix more evenly, so pull eggs and butter out 30 minutes before starting.

No key limes? Regular lime juice at half the quantity plus a splash of lemon gets you close. Out of buttermilk? Whole milk plus 1 tbsp vinegar or lemon juice works perfectly. For a lighter texture, cake flour instead of all-purpose gives a finer crumb. The cream cheese must be full-fat—Philadelphia brand is the most reliable for frosting. Don’t skimp on the zest: it’s where most of that signature flavor lives.

Cake layers can be baked 1 day ahead—wrap tightly in plastic once cooled. Frosting holds up well too if stored separately. The finished cake keeps 3-4 days refrigerated. For best results, let it sit at room temperature 20 minutes before serving to soften slightly.

Step-by-Step Instructions for Key Lime Cake

This method ensures perfect texture and bold citrus flavor in every bite.

Step 1: Prepare the Cake Batter

Preheat your oven to 350°F and grease and flour three 8-inch round cake pans. In a large bowl, whisk together the 3 cups All-Purpose Flour, 1 tbsp Baking Powder, 0.5 tsp Baking Soda, and 0.5 tsp Salt until fully combined.

In a separate bowl, cream the 1 cup Unsalted Butter with 1½ cups of the 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.

Mix in the 1 cup Buttermilk, 0.5 cup Fresh Key Lime Juice, 2 tbsp Key Lime Zest, and 2 tsp Vanilla Extract. Gradually add the dry ingredients to the wet ingredients, mixing just until combined to avoid overworking the batter.

Step 2: Bake the Cake Layers

Divide the batter evenly among the prepared cake pans, smoothing the tops with a spatula. Bake for 22-25 minutes, or until a toothpick inserted into the center of each layer comes out clean.

Check for doneness by gently pressing the top of the cakes—they should spring back lightly. The edges will pull away slightly from the pans when they’re done. Be careful not to overbake, as this can dry out the layers.

Remove the cakes from the oven and let them cool in the pans for 10 minutes. Then, transfer them to a wire rack to cool completely before frosting.

Step 3: Make the Cream Cheese Frosting

In a large mixing bowl, beat the 16 oz Cream Cheese until smooth and creamy. Gradually add the 1 cup Unsalted Butter and mix until fully combined.

Slowly incorporate the remaining ½ cup Granulated Sugar and the 4 cups Confectioners Sugar, one cup at a time, beating well after each addition. Add the 2 tsp Vanilla Extract and mix until the frosting is light and fluffy, about 3-4 minutes.

Step 4: Assemble 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 place the final layer on top. Spread the remaining frosting over the top and sides of the cake, creating a smooth finish.

For a rustic look, use a spatula to create swirls or peaks in the frosting. For extra flair, garnish with additional Key Lime Zest or thin slices of lime. Serve the cake at room temperature for the best texture and flavor.

Troubleshooting This Recipe

Dense Cake Layers

If your cake turns out dense, it’s likely the batter was overmixed. Fold dry ingredients in just until combined—40-50 strokes max. Also, ensure your baking powder is fresh; it loses potency after 6-12 months. 💡

Cake Sinks in Middle

This happens when the center isn’t fully set before removing from the oven. Use the toothpick test: it should come out clean or with a few moist crumbs, not wet batter. Also, avoid opening the oven door during the first 15 minutes of baking.

Frosting Too Thin

If your cream cheese frosting is runny, the butter or cream cheese wasn’t cold enough. Chill the bowl and beaters for 10 minutes before starting. Add 1-2 cups more Confectioners Sugar gradually until it thickens to a spreadable consistency.

Frosting Too Sweet

Balance the sweetness by adding 1-2 tbsp Fresh Key Lime Juice or a pinch of salt. The acidity cuts through the sugar beautifully. I often add 1 tbsp at a time, tasting as I go.

Cake Layers Stick

Prevent sticking by lining pans with parchment paper circles. Grease the pans thoroughly, then dust with flour, tapping out excess. Let cakes cool for 10 minutes before removing to help them release cleanly. 🍈

Uneven Baking

For even layers, rotate pans halfway through baking. Use an oven thermometer to verify 350°F—many ovens run hot or cold. Also, avoid placing pans too close together, as this blocks heat circulation.

Frequently Asked Questions