Key Lime Sheet Cake

4.35 from 40 votes

Key Lime Sheet Cake is our citrus take on a buttermilk sheet cake, with a light lime frosting. It's the perfect cake is great for summer picnics.

Prep Time10

Cook Time11

Total Time21

Course: Dessert

Cuisine: American

Servings:

Calories: 468kcal

Preheat oven to 400ºF. Spray an 11x17" rimmed baking sheet with non-stick cooking spray.
In a large bowl, whisk together sugar, flour, baking soda and salt. 1 3/4 cups granulated sugar, 2 cups all-purpose flour, 1/4 teaspoon salt, 1/2 teaspoon baking soda
Whisk in the melted butter, oil, lime zest and lime juice, and boiling water. 1/2 cup salted butter, 1/2 cup vegetable oil, 3 fresh limes, 3/4 cup boiling water
Whisk in eggs, buttermilk and vanilla. Whisk just until smooth. 2 large eggs, 1/2 cup buttermilk, 1 teaspoon vanilla extract
Pour batter into prepared pan and bake for 11-13 minutes. The top should spring back when you touch it, or a toothpick inserted into the center should come out with a few moist crumbs. .
In a medium bowl, whisk together melted butter, powdered sugar, milk, vanilla and lime juice. Stir until smooth, adding more lime juice as needed to thin the icing to the desired consistency. Spread frosting on the warm cake. Top with extra lime zest and lime slices for garnish.

Store the cake covered at room temperature for up to 3 days. This cake also freezes well in an airtight container for up to 3 months.
Refer to the article above for more tips and tricks.
The calories shown are based on the cake being cut into 15 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information. **