Description

Key Lime Sheet Cake is the perfect citrusy treat for any summer occasion. This refreshing dessert combines the tanginess of fresh lime with the soft, light texture of a buttermilk sheet cake, topped with a luscious lime frosting. It’s a simple yet elegant cake that’s sure to impress guests at a picnic, barbecue, or family gathering.

Ingredients

For the Cake:

1 3/4 cups granulated sugar

2 cups all-purpose flour

1/4 teaspoon salt

1/2 teaspoon baking soda

1/2 cup salted butter, melted

1/2 cup vegetable oil

Zest of 3 limes

1/4 cup fresh lime juice

3/4 cup boiling water

2 large eggs, beaten

1/2 cup buttermilk

1 teaspoon vanilla extract

For the Frosting:

1/2 cup salted butter, melted

4 cups powdered sugar

3 tablespoons whole milk

1 teaspoon vanilla extract

1–2 tablespoons lime juice

Lime zest for garnish

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Instructions

Preheat your oven to 400°F. Spray an 11×17-inch rimmed baking sheet with non-stick cooking spray.
In a large bowl, whisk together the sugar, flour, salt, and baking soda.
Add the melted butter, vegetable oil, lime zest, lime juice, and boiling water to the dry ingredients, and whisk to combine.
Whisk in the beaten eggs, buttermilk, and vanilla extract. Mix until the batter is smooth.
Pour the batter into the prepared pan and bake for 11-13 minutes. The cake is done when the top springs back to the touch or when a toothpick inserted into the center comes out with a few moist crumbs.
While the cake is baking, prepare the frosting. In a medium bowl, whisk together the melted butter, powdered sugar, milk, vanilla extract, and lime juice until smooth. Add more lime juice if needed to reach your desired frosting consistency.
Once the cake has cooled slightly, spread the frosting on top. Garnish with extra lime zest and lime slices.

Notes

Gluten-Free: Use a gluten-free all-purpose flour blend to make the cake gluten-free.
Dairy-Free: Replace the butter with a dairy-free option and use almond or oat milk instead of whole milk in the frosting.
Tropical Twist: Add some shredded coconut to the batter for a tropical flavor boost.
Extra Citrus: For a more intense lime flavor, you can add a bit of lime extract to the cake or frosting.

Prep Time: 10 minutes
Cook Time: 11 minutes
Category: Dessert
Method: Baking
Cuisine: American

Nutrition

Serving Size: 1 slice
Calories: 350 kcal
Sugar: 50g
Sodium: 150mg
Fat: 18g
Saturated Fat: 8g
Unsaturated Fat: 9g
Trans Fat: 0g
Carbohydrates: 42g
Fiber: 2g
Protein: 3g
Cholesterol: 35mg