Key Lime Pie Sheet Cake
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Key Lime Pie Sheet Cake is a bright, creamy cake with the flavors of key lime pie. It has a cake base, a tangy and creamy lime layer, and Cool Whip on top. This sheet cake is simple to make and great for feeding a crowd.

Cooking Tips and Substitutions
If you want a stronger lime flavor, add a little lime zest to the lime layer. Be careful not to add too much, as it can become bitter. If you prefer a less sweet dessert, you can reduce the amount of condensed milk slightly.

How to make Homemade Whipped Cream
For a homemade whipped topping, you can use heavy cream and powdered sugar instead of store-bought whipped topping. This will give the cake a fresher taste and a slightly different texture. Make sure to whip the cream until it forms stiff peaks before spreading it on top of the cake.

Ingredients
The full recipe with ingredient amounts and instructions is at the bottom of this post. You can save a tree and the recipe to your personal and private recipe box here on Call Me PMc. This way, youโll never misplace it.
For the Cake
For the Lime Layer
- 14 ounces sweetened condensed milk
- ยฝย cupย fresh key lime, lime, or Nellie & Joeโs Key West Lime Juice
Top Layer
- 8 ounces Cool Whip

Key Lime Pie Sheet Cake FAQ
- Can I use a different cake mix? Yes, a yellow cake mix can work if you donโt have a white cake mix. The flavor will be slightly different but still good.
- Can I make this cake ahead of time? Yes, this cake can be made a day in advance. Store it in the refrigerator until ready to serve.
- How should I store leftovers? Keep leftovers covered in the refrigerator for up to three days.
- Can I use homemade whipped cream instead of Cool Whip? Yes, but it will have a softer texture and may not hold up as long in the fridge.

Key Lime Pie Sheet Cake Conclusion
This cake is a simple dessert with a refreshing citrus flavor. Itโs easy to make with a boxed cake mix and a lime layer that adds the right amount of tartness. Perfect for gatherings, this cake is easy to make and feeds a crowd.

Key Lime Pie Sheet Cake
Equipment
Ingredients
For the Cake
- 1 box white cake mix or yellow
- ยพ cup vegetable oil
- ยพ cup whole milk
- 3 large eggs at room temp
For the Lime Layer
- 14 ounces sweetened condensed milk
- ยฝ cup Nellie & Joeโs Key West Lime Juice fresh key or lime juice
For the Whipped Cream
- 8 ounces Cool Whip
Instructions
For the Cake
- Preheat oven to 350 degrees F.
- Spray a 9×13 inch cake pan with Wilton cake release.
- In a bowl beat together the cake mix, milk, oil, and eggs until light and fluffy, about 2 minutes.1 box white cake mix, ยพ cup vegetable oil, ยพ cup whole milk, 3 large eggs
- Pour batter into prepared pan and bake 25 to 27 minutes or until done.
- Remove from oven and allow to cool completely before topping.
For the Lime Layer
- In a bowl combine sweetened condensed milk and lime juice.14 ounces sweetened condensed milk, ยฝ cup Nellie & Joeโs Key West Lime Juice
- Whisk or mix with an electric mixer until mixture thickens. This will take 60 to 90 seconds.
- Pour over cooled cake and refrigerate until filling sets about 15 minutes.
Put it together
- Spread over cooled cake.8 ounces Cool Whip
Nutrition
Nutritional information given is an automatic calculation and can vary based on the exact products you use and changes you make to the recipe. If these numbers are important to you, I recommend calculating them yourself.