The Best Key Lime Cake Recipe – Light, Fluffy and So Easy to Make

This key lime cake recipe is soft, light, and full of fresh lime flavor. It has the perfect mix of sweet and tangy in every bite. The texture is moist and fluffy, making it a dessert that feels simple but tastes special.

If you enjoy easy key lime desserts, this cake is a great choice. It uses basic ingredients and simple steps, so you do not need any special skills. The creamy frosting adds a smooth and rich finish to the bright citrus cake.

This homemade key lime cake is perfect for family desserts, small celebrations, or even a weekend treat. It is easy to make and always turns out delicious.

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Why You Will Love This Key Lime Cake Recipe

• Soft and moist cake with a tender crumb
• Fresh and bright lime flavor in every bite
• Simple ingredients that are easy to find
• Easy step-by-step process for beginners
• Perfect balance of sweet and tangy
• Works for layered cakes, sheet cakes, or cupcakes
• Great make-ahead dessert for gatherings

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Ingredients

For the Cake

• 2 1/2 cups all-purpose flour
• 1 1/2 cups sugar
• 1/2 cup butter, softened
• 1/2 cup oil
• 1 cup milk
• 4 large eggs
• 1/4 cup key lime juice
• 1 tbsp lime zest
• 2 tsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp salt

For the Frosting

• 8 oz cream cheese, softened
• 1/2 cup butter, softened
• 3–4 cups powdered sugar
• 2 tbsp key lime juice
• 1 tsp lime zest

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Ingredient Notes and Substitutions

• Fresh lime juice gives the best flavor, but bottled juice can be used if needed
• Regular limes can replace key limes without changing the recipe much
• Buttermilk can be used instead of milk for a softer texture
• Oil helps keep the cake moist, so do not skip it
• Cream cheese should be soft to avoid lumps in frosting
• Powdered sugar amount can be adjusted based on how sweet or thick you want the frosting

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Step-by-Step Instructions

Prepare the Oven and Baking Pan

Preheat the oven to 350°F. Lightly grease your baking pan with butter or oil. You can also line the bottom with parchment paper to help the cake come out easily. Make sure the pan is ready before mixing the batter so the cake can go straight into the oven.

Mix the Dry Ingredients Properly

In a medium bowl, add the flour, baking powder, baking soda, and salt. Whisk everything together until well combined. This step helps the cake rise evenly and prevents lumps in the batter. Set this bowl aside.

Cream Butter, Oil, and Sugar Until Light

In a large mixing bowl, add the softened butter, oil, and sugar. Use a hand mixer or whisk to beat the mixture until it looks light, pale, and fluffy. This step is very important because it adds air into the batter, making the cake soft.

Add Eggs One at a Time

Crack one egg into the mixture and beat until fully mixed. Repeat with the remaining eggs, adding one at a time. Mixing slowly helps the batter stay smooth and prevents it from separating.

Add Lime Juice and Zest for Flavor

Pour in the key lime juice and add the lime zest. Mix gently until combined. The batter may look slightly curdled at this stage, which is normal because of the citrus.

Combine Wet and Dry Ingredients Carefully

Add half of the dry ingredients into the wet mixture and mix gently. Then pour in the milk and mix again. Add the remaining dry ingredients and stir until just combined. Do not over mix, as this can make the cake dense instead of soft.

Pour Batter and Prepare for Baking

Pour the batter into the prepared baking pan. Use a spatula to spread it evenly, but do not worry if the surface is not perfectly smooth. Tap the pan lightly on the counter to remove air bubbles.

Bake the Cake Until Done

Place the pan in the oven and bake for 30 to 35 minutes. Check the cake by inserting a toothpick into the center. If it comes out clean or with a few crumbs, the cake is ready. Remove from the oven and let it cool in the pan for 10 to 15 minutes before transferring to a cooling rack.

Prepare the Creamy Lime Frosting

In a mixing bowl, beat the cream cheese and butter until smooth and creamy. Slowly add powdered sugar, one cup at a time, mixing well after each addition. Pour in the lime juice and add the zest. Continue mixing until the frosting is soft, smooth, and easy to spread.

Frost the Cake Evenly

Make sure the cake is fully cooled before adding frosting. Spread the frosting over the top using a spatula. You can create soft swirls or keep it simple. Sprinkle extra lime zest on top for added flavor and a fresh look.

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Tips for the Best Key Lime Cake

• Use room temperature ingredients for smooth mixing
• Do not over mix the batter after adding flour
• Always use fresh lime zest for strong citrus flavor
• Let the cake cool completely before frosting
• Chill the cake slightly before slicing for cleaner cuts
• Measure flour correctly to avoid a dry cake

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Variations and Add-Ins

• Add shredded coconut for a tropical flavor
• Mix in white chocolate chips for extra sweetness
• Add a simple lime glaze instead of frosting for a lighter dessert
• Turn the batter into cupcakes for easy serving
• Add crushed graham crackers between layers for a key lime pie feel

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What to Serve With Key Lime Cake

• Fresh whipped cream
• Vanilla ice cream
• Mixed berries or strawberries
• Iced tea or lemonade
• Light fruit salad

This best key lime cake recipe is soft, fresh, and full of bright flavor. It is easy to make and gives you a dessert that feels light but still rich and satisfying. The creamy frosting and citrus cake come together in the best way.

If you are looking for easy key lime dessert recipes, this cake is a great one to try. It is simple, delicious, and perfect for sharing.