For the Cake:
- 2 ½ cups all-purpose flour
- 2 ½ tsp baking powder
- ½ tsp salt
- 1 cup unsalted butter, softened
- 2 cups granulated sugar
- 4 large eggs
- 1 tbsp key lime zest (about 2–3 key limes)
- ¼ cup key lime juice (freshly squeezed is best!)
- 1 ½ tsp vanilla extract
- 1 cup buttermilk
For the Key Lime Cream Cheese Frosting:
- 8 oz cream cheese, softened
- ½ cup unsalted butter, softened
- 4 cups powdered sugar, sifted
- 2 tbsp key lime juice
- 1 tsp key lime zest
- 1 tsp vanilla extract
Step-by-Step Instructions
1. Preheat and Prep
- Preheat your oven to 350°F (175°C) .
- Grease and lightly flour two 9-inch round cake pans, or line them with parchment paper for easy removal.
2. Mix the Dry Ingredients
- In a medium bowl, whisk together the flour, baking powder, and salt . Set aside.
3. Cream the Butter and Sugar
- In a large mixing bowl, use a hand or stand mixer to cream the softened butter and granulated sugar until light and fluffy (about 2–3 minutes). This step ensures a tender crumb.
4. Add Eggs and Flavorings
- Beat in the eggs , one at a time, ensuring each egg is fully incorporated before adding the next.
- Mix in the key lime zest, key lime juice, and vanilla extract until combined.
5. Combine Wet and Dry Ingredients
- Gradually add the dry ingredients to the wet mixture in three parts, alternating with the buttermilk . Begin and end with the dry ingredients. Mix on low speed until just combined—do not overmix, as this can make the cake dense.
6. Bake the Cake
- Divide the batter evenly between the prepared pans. Smooth the tops with a spatula.
- Bake for 25–30 minutes , or until a toothpick inserted into the center comes out clean.
- Allow the cakes to cool in the pans for 10 minutes, then carefully transfer them to a wire rack to cool completely.
7. Make the Key Lime Cream Cheese Frosting
- In a large mixing bowl, beat the softened cream cheese and butter together until smooth and creamy.
- Gradually add the powdered sugar , one cup at a time, mixing on low speed to avoid a sugar cloud. Once all the sugar is added, increase the speed and beat until light and fluffy.
- Mix in the key lime juice, key lime zest, and vanilla extract until fully incorporated. Taste and adjust the lime juice or zest if desired for a stronger citrus flavor.
8. Assemble the Cake
- 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 frost the top and sides of the cake with the remaining frosting. Use a spatula or bench scraper for a smooth finish, or create decorative swirls with an offset spatula for a rustic look.
- Sprinkle additional key lime zest on top for a pop of color and extra flavor.
Tips for Success
- Fresh Key Limes : If you can’t find fresh key limes, bottled key lime juice works in a pinch, but fresh zest is essential for that authentic citrus aroma.
- Room Temperature Ingredients : Ensure your butter, cream cheese, and eggs are at room temperature for a smooth batter and frosting.
- Don’t Overbake : Overbaking can dry out the cake. Start checking for doneness at the 25-minute mark.
- Storage : Store leftovers in an airtight container in the refrigerator for up to 3 days. Bring to room temperature before serving for the best texture.
Serving Suggestions
This Key Lime Cake pairs beautifully with:
- A dollop of whipped cream or a scoop of vanilla ice cream for extra indulgence.
- A garnish of fresh berries like raspberries or strawberries for a pop of color.
- A tall glass of cold milk, iced tea, or sparkling water with a slice of lime.
Final Thoughts
This Key Lime Cake with Key Lime Cream Cheese Frosting is the perfect balance of tangy and sweet, with a moist, tender crumb and a decadent frosting that ties it all together. Whether you’re celebrating a special occasion or simply craving something bright and delicious, this cake is guaranteed to impress.
So grab those key limes, preheat your oven, and let the zesty magic begin! 🍋✨
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