Key Lime Sheet Cake
Jun 11, 2025 12:34 PM
Key Lime Sheet Cake is a citrus take on buttermilk sheet cake, with a light frosting with a hint of lime, this cake is great for summertime gatherings.
Key lime juice, buttermilk, oil and butter make this the most moist sheet cake you’ll have all summer! Many key lime cakes are made with a white cake mix, but this key lime sheet cake is 100% from scratch, mixes easily by hand, bakes in an 11×17″ sheet pan and is full of fresh lime flavor.
During the summer I crave ALL the fresh citrus flavors. Key lime pie, key lime cookies and lemon squares are always on my list to make. The tart, bright flavors just goes well with the warm weather. This key lime sheet cake has quickly become my favorite lime dessert. A yummy combination of tart and sweet.
Sheet cakes are simple to make and I love that they feed a crowd. Sheet cakes are thinner than regular cake baked in a 9 x 13-inch, but that just means its a light dessert for those warm summer days.
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
- 3 fresh limes zest of 3 limes and ¼ 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
Prep Time:
10 minutes
Cook Time:
11 minutes
Total Time:
21 minutes
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