Duncan Hines Key Lime Cake Recipe: Zesty Citrus Layers With Cream Cheese Frosting

This layer cake delivers bright citrus flavor with a tender crumb and cream cheese frosting that balances the tang perfectly. I developed this method after testing multiple box mix variations to achieve professional results.

The key is enhancing the mix with fresh lime zest and juice, then layering with a filling that complements without overpowering. It bakes up moist every time with that signature key lime character.

Ingredients for Duncan Hines Key Lime Cake

Bright citrus and creamy frosting come together for this crowd-pleasing layer cake.

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The key limes are non-negotiable here. Look for fresh key limes at Latin markets or well-stocked supermarkets—they’re smaller and seedier than regular limes but pack that signature floral tartness. Nellie & Joe’s Key West Lime Juice works in a pinch if fresh isn’t available, but nothing beats the real thing. The cake mix itself is Duncan Hines Classic Yellow; don’t substitute another brand as the texture differs.

Out of key lime juice? Regular lime juice plus a splash of orange juice gets you close. No cream cheese? Neufchâtel cheese (lower fat) works, but the frosting will be slightly softer. For a lighter version, Greek yogurt at half the amount can replace some cream cheese, though the texture won’t be as stable. Always use full-fat cream cheese—reduced-fat versions make runny frosting.

Bake layers a day ahead—they actually taste better after chilling. Unfrosted cakes keep 2 days at room temperature or 1 week frozen. Frosted cake holds 3 days in the fridge. Bring cream cheese and butter to room temp before mixing for ultra-smooth frosting.

Instructions

Master this technique for perfectly moist, citrus-infused layers with a velvety frosting finish.

Step 1: Prepare the Cake Pans and Preheat Oven

Begin by preheating your oven to 350°F. Lightly dust two 9-inch round cake pans with the 0.25 cup All-Purpose Flour after coating them thoroughly with the Baking Spray.

This dual-layer preparation ensures the cakes release cleanly while maintaining their structure. The flour dusting creates a thin barrier that prevents sticking, especially important for the delicate crumb of this citrus-infused cake.

Step 2: Mix the Cake Batter

In a large mixing bowl, combine the 1 box Duncan Hines Classic Yellow Cake Mix, 0.33 cup Vegetable Oil, 3 whole Large Eggs, and 1.25 cups Water. Beat on medium speed for 2 minutes until smooth and well incorporated.

Fold in the 0.5 cup Key Lime Juice and 2 tbsp Key Lime Zest by hand to maintain the air you’ve just beaten into the batter. The zest provides concentrated citrus flavor while the juice adds the signature tang.

Step 3: Bake the Cake Layers

Divide the batter evenly between the prepared pans. Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean. Rotate the pans halfway through baking for even browning.

The cakes are done when they spring back lightly when touched and the edges begin to pull away from the pan sides. Allow them to cool in the pans for 10 minutes before turning out onto wire racks to cool completely.

Step 4: Prepare the Cream Cheese Frosting

In a stand mixer, beat the 16 oz Cream Cheese and 0.5 cup Unsalted Butter until smooth and creamy. Gradually add the 4 cups Powdered Sugar, mixing on low speed until combined.

Increase the speed to medium and beat for 2-3 minutes until light and fluffy. Stir in the 1 tsp Vanilla Extract and the remaining 0.5 cup Key Lime Juice from your measured amount. The frosting should be spreadable but maintain its shape.

Step 5: Assemble and Frost the Cake

Place one cake layer on a serving plate. Spread a generous layer of frosting over the top. Add the second layer and cover the entire cake with a thin crumb coat. Chill for 15 minutes to set the crumb coat.

Apply the remaining frosting in an even layer over the top and sides of the cake. For a professional finish, use a bench scraper to smooth the sides while turning the cake plate. The final result should have clean edges and a slightly textured surface from the citrus-infused frosting.

Creative Variations of duncan hines key lime cake

Tropical Twist

Add ½ cup toasted coconut flakes to the frosting for a tropical-inspired variation. I also fold in ¼ cup crushed pineapple (well-drained) to the cake batter for extra moisture and flavor depth. The combination reminds me of a Florida sunset after a long coastal ride. 🌴

Lime Glaze Drizzle

For a lighter option, replace the cream cheese frosting with a simple glaze. Whisk 2 cups powdered sugar with 3 tbsp key lime juice and 1 tbsp zest. Drizzle over cooled layers and let it set. This version is perfect for warm days when you want something refreshing.

Citrus Layer Boost

Create a tangy filling by mixing 1 cup lime curd with ½ cup whipped cream. Spread this between the layers before frosting for an intense citrus experience. I use Stonewall Kitchen lime curd when I’m short on time.

Spiced Variation

Add ½ tsp ground ginger and ¼ tsp cardamom to the cake batter for a warm, spiced note. These spices complement the lime beautifully without overpowering it. I discovered this combo while experimenting with wild herbs in my foraging expeditions. ✨

Cupcake Conversion

Divide the batter into 24 lined cupcake tins and bake for 18-20 minutes at 350°F. Pipe the frosting on top for a portable version. These are great for potlucks or local BBQ competitions where easy serving is key.

Key Lime Pie Swirl

Swirl 1 cup key lime pie filling into the cake batter before baking. This creates marbled slices with pockets of tangy filling. I use Marie Callender’s pie filling for convenience, but homemade works even better.