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Key Lime Cake is an easy cake recipe that screams summer dessert! The cake is filled with lime flavor and saturated with key lime glaze and a lime whipped cream topping. It’s the BEST party cake and it’s lower in added sugar, thanks to SPLENDA® Naturals Sugar & Stevia Sweetener Blend.

Easy Key Lime Cake from scratch on white plate with bite missing - this perfect cake recipe is made with key lime juice and then soaked with key lime glaze and topped with fresh whipped cream.

Well, we’re back from Canada and we survived customs! Somehow I managed to overpack on the way there, which necessitated one huge suitcase and two roller bags stuffed full, so when I spent all the money in Canada on all the things, I had to sit on the three suitcases to get them to zip (and check all of them). We carried on two huge tote bags filled with more stuff I couldn’t get in the suitcases.

Have you seen that meme on Facebook that says “I need three days of outfits, so I packed 25 just in case”? Yeah, that’s totally me. I am the worst at over packing. My large checked suitcase was 50 pounds on the dot!

I absolutely fell in love with Canada. It’s probably one of my favorite places, besides San Francisco and Hawaii. I especially love the food (poutine!!!) and candy. One of my suitcases was full of candy, I kid you not. Caramel, chocolate, nuts, you name it I bought it.

Something I didn’t see a lot of in Canada was anything Key Lime flavored. Key Lime is one of my favorite desserts, whether it’s a pie or a cake or just candy. Lime, like lemon, is one of the flavors I can’t get enough of. I actually prefer it to chocolate, if you can believe that.

Easy Key Lime Cake from scratch on white plate with fork - this perfect cake recipe is made with key lime juice and then soaked with key lime glaze and topped with fresh whipped cream. It's even lower in added sugar!

When I was prepping for our last summer barbecue, I wanted to make a cake. Sometimes I just love serving cake at parties, probably because I hardly ever make them. Cakes are delicious, but I never need something that big for only 3 people.

I couldn’t decide if I should make a bundt cake or a cake from scratch, but this key lime cake from scratch one won out.

It’s an easy from scratch key lime cake recipe, topped with a key lime glaze while it’s still hot (so it soaks in and makes the cake incredibly moist) and then it’s topped with a homemade whipped cream filled with more lime flavor.

It’s moist and super flavorful with the perfect tartness of the lime paired with the sweetness of cake. Everyone who tasted it just loved the flavor and texture.

Key Lime Cake on white plate made with Splenda Naturals bag behind

Guess what else is amazing about this key lime cake? It’s lower in added sugar!

I decided to use SPLENDA® Naturals Sugar & Stevia Sweetener Blend instead of full sugar like I normally do. The baking blend is half sugar and half sweetener, so you don’t need as much as regular sugar and it cuts down on the sugar in the cake.

The cake recipe is adapted from my favorite lemon cupcake recipe, except it’s made in a 9″ square baking pan and made with the baking blend instead of full sugar. The product is a rich cake full of key lime juice and zest.

While the cake was baking I made a lime simple syrup using key lime juice and the baking blend. You cook it until the sugar is dissolved and it boils, then let it cool while the cake finishes baking. Once the cake come out of the oven, simply poke some tiny holes with a toothpick and pour the glaze over it.

Once the cake has cooled, it’s topped with an easy whipped cream. I added a bunch of lime zest to the cream and sweetened it with more SPLENDA® Naturals Sugar & Stevia Sweetener Blend.

I think this is one of those cakes I will be making for years to come, and it’s the perfect summer recipe. I can’t eat key lime without thinking of summer.

Easy Key Lime Cake from scratch collage - this perfect cake recipe is made with key lime juice and then soaked with key lime glaze and topped with fresh whipped cream.

How to make a Key Lime Cake with less sugar:

  • I added a note in the recipe if you want to use regular sugar.
  • You can use any kind of sweetener, but note that I used a blend; that is it’s part granulated and part Splenda.
  • This cake turns out a bit more dense than a normal cake because it’s made with sweetener.
Easy Key Lime Cake, made from scratch

Key Lime Cake

5 from 2 votes
Key Lime Cake Recipe - an easy cake recipe filled with lime flavor and saturated with key lime glaze and a lime whipped cream topping. It's the BEST party cake!
Prep Time 30 minutes
Cook Time 35 minutes
Yield 12 servings
Serving Size 1 slice



  • 1 1/2 cups all-purpose flour
  • 1 teaspoon baking powder
  • 1/2 teaspoon salt
  • 1/2 cup vegetable oil
  • 1/2 cup SPLENDA® Naturals Sugar & Stevia Sweetener Blend
  • 3 large eggs
  • 1 tablespoon vanilla extract
  • 1/4 cup key lime juice
  • 1 tablespoon lime zest from about 1 large or 2 medium limes
  • 1/2 cup milk


  • 3 ounces key lime juice about 6 tablespoons
  • 2 tablespoons SPLENDA Naturals Sugar & Stevia Sweetener Blend

Whipped Cream Topping:

  • 1 cup heavy whipping cream
  • 1 tablespoon SPLENDA Naturals Sugar & Stevia Sweetener Blend
  • Zest of one small or half a large lime
  • Additional zest and/or lime slices for garnish (optional)


  • Preheat oven to 350°F. Spray a 9” square pan with nonstick cooking spray, or butter and flour it.
  • Whisk flour, baking powder, and salt in a medium bowl.
  • Add oil and SPLENDA to a large bowl and with hand mixer or stand mixer, until thick and yellow. Add eggs one at at time, beating after each addition. Beat in vanilla extract, lime juice, and zest.
  • Add the flour mixture and milk alternately, starting and ending with the flour. Don’t over mix! Pour batter into prepared pan.
  • Bake for 25-35 minutes until a toothpick comes out clean. Note: the cake will look a bit different when done than a normal cake does; this is because of the sugar substitute. Use the toothpick to test doneness.
  • While the cake is baking, make the glaze by heating the lime juice and SPLENDA in a small pan over medium heat. Cook just until it starts to boil, stirring to make sure the sugar is dissolved. Remove from heat and cool until the cake is done.
  • When the cake comes out of the oven, poke several tiny holes all over the top of the cake with a toothpick. Pour the glaze over the top. Cool completely before frosting.
  • Make the whipped cream frosting: beat cold heavy whipping cream until stiff peaks form, slowly adding the SPLENDA and lime zest during mixing. Frost the top of the cake and sprinkle with more lime zest and/or lime slices.
  • Best served the day it’s frosted with the whipped cream, but the cake can be made up to 24 hours in advance (cover cooled cake tightly with plastic wrap and store on the counter). Frost just before serving.

Recipe Nutrition

Serving: 1slice | Calories: 318kcal | Carbohydrates: 27g | Protein: 4g | Fat: 21g | Saturated Fat: 8g | Cholesterol: 75mg | Sodium: 171mg | Fiber: 1g | Sugar: 14g
Nutritional information not guaranteed to be accurate
Author Dorothy Kern

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I’m sharing SPLENDA® Sweetener Products in my life as part of a sponsored series for Socialstars™” #SplendaSweeties #SweetSwaps

Last Updated on May 12, 2020

Dorothy Kern

Welcome to Crazy for Crust, where I share recipes that are sometimes crazy, often with a crust, and always served with a slice of life.

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  1. Can this be made without milk and additional juice instead?

    Also, if made with real sugar, how much should go in the cake mix? The recipe says 1 cup, but a response in the Comments says 1 1/4 cups.


  2. It’s like SPRING time on a plate.  I served this at a family brunch and everyone enjoyed it so much!

  3. Hi, I just made this recipe and though it has good taste the cake came out flat, did not rise. Could it be because I used lactose free milk? If not, why could it be?