Keto Key Lime Pie


A silky flavorful lime filling on a flaky keto pie crust

5 Stars (2 Reviews) 5 Comments

This keto key lime pie will please everyone - even your non-keto friends and family. We start with a flaky, buttery low carb pie crust and fill it with a creamy, velvety lime filling. We don't have to cheat and use cream cheese for the filling. Instead, we make our own sweetened condensed milk - just like the traditional recipe for key lime pie uses!

I always like to have a few desserts that I can bring for the holidays (like Easter or Mother’s Day) or to a summer potluck. This keto key lime pie recipe is one of those that I know will be a crowd pleaser no matter what eating lifestyle they follow. Just like my keto peanut butter pie or my chocolate cream pie.

For this pie recipe, we nailed the combination of tart and sweet making this keto pie absolutely irresistible. Fresh limes are used in the filling. Even though the title says, you don’t have to use key limes for this recipe. Large, regular limes can be used. To balance the tartness from the limes, we make our own sugar free sweetened condensed milk – which is quite easy to make and can be made ahead of time.

close up of the flaky pie crust on a key lime pie

Other keto key lime pie recipes use cream cheese to thicken their lime filling, but that’s a stray from the original flavor and traditional recipe. Most classic key lime pie recipes use sweetened condensed milk to help thicken and sweetened the pie. Unfortunately, store bought canned sweetened condensed milk is not keto approved, but it’s really easy to make your own.

Key lime pie is one of those sweet indulgences that you will want to eat two slices. It’s perfect for the hot summer day or a Spring holiday party.

How to make keto key lime pie

  1. Make keto sweetened condensed milk. Combine butter, powdered sweetener and heavy cream in a saucepan and let simmer for 30 minutes until thickened. Refrigerator for at least 2 hours. This can be made up ahead of time. It will stay fresh in the refrigerator for up to 2-3 weeks or you can freeze it!
  2. Prepare key lime filling. Combine egg yolks with lime zest. Stir in keto sweetened condensed milk. Then slowly stir in freshly squeezed lime juice. Set aside for 30 minutes to thicken.
  3. Blind bake low carb pie crust. Prepare a batch of flaky pie crust. You can also make your own keto graham cracker crust if you prefer that flavor. Bake crust for 8 minutes.
  4. Assemble pie. Pour key lime filling into cooled pie crust and bake.
  5. Refrigerate pie. The lime pie will continue to set as it cools in the refrigerator for 2 hours.
  6. Top with whipped cream. Make your own sugar free whipped cream by combining heavy whipping cream and powdered sugar free sweetener.

a slice of pie sits in the corner with a slice out of a pie in the pie plate with the rest of the pie

Key ingredients

  • Sugar free sweetened condensed milk – In this recipe, we start by making our own sweetened condensed milk. It’s easier than you think and only requires 3 ingredients – butter, powdered sweetener and heavy cream. This is an ingredient that can be prepped up ahead of time so if you are making this keto pie for a special occasion and want to save time, you can make up a batch a few days before you make your pie.
  • Egg yolks – Egg yolks are used to help thicken the pie. When combined with the acid from the key lime juice, the filling will solidify after baking and cooling.
  • Lime zest & lime juice – To maximize the tart lime flavoring, we add fresh lime zest. This allows for that punch of lime flavor without all the extra carbs from the key lime juice.
  • Keto pie crust – For this low carb pie recipe, we are using my buttery, flaky pie crust; however, another option is to use this basic crust. It taste similar to graham cracker pie crust.

Keto Key Lime Pie Recipe Video

Subscribe to the KetoFocus YouTube Channel

With 100s of videos and millions of views, Ketofocus is one of the most popular Keto channels on YouTube.

Keto Sweetened Condensed Milk Ingredients

Key Lime Pie Filling Ingredients

  • 4 teaspoons lime zest
  • 4 egg yolks
  • 1/2 cup lime juice (from 4 limes or 20 key limes)

Keto Pie Crust Ingredients

Keto Whipped Cream Ingredients

Keto Key Lime Pie Directions

  • Keto Key Lime Pie
  • a small slice of key lime pie on a plate with a fork the text below the pie states without cream cheese

    What is a key lime?

    Here are some differences between a key lime and a regular lime that we see in America:

    • Key limes come from Mexico or India. They tend to be more aromatic and tarter than regular limes.
    • At a slightly more yellow color, key limes are also smaller and have more seeds.
    • They can be hard to come by and if that’s the case, just use regular limes!

    Keto graham cracker crust option

    I made a flaky pastry crust for this keto pie recipe; however, a graham cracker crust can be made instead. The texture of this crust is very similar to if you had graham crackers. In order to get the graham cracker flavoring, you can add graham cracker flavoring drops. For the best keto graham cracker crust, use this recipe from my keto cheesecake.

    a slice of key lime pie on a white plate with a dollop of whipped cream and lime slice on top

    How to make a meringue topping

    This version of key lime pie uses a whipped cream topping but you can add a meringue topping if preferred. To make a keto meringue topping follow the instructions on this lemon meringue pie.

    close up of the flaky pie crust on a key lime pie

    Make ahead tips

    • Keto sweetened condensed milk can be made up to several weeks ahead of time. It can be stored in the refrigerator and will stay as fresh as the date on the heavy cream.
    • The pie crust can be made a few days in advanced. You can leave the crust unbaked in the refrigerator for 3-4 days or freeze it for up to 1 month. Bake crust can be made 1-2 days ahead of time and stored in the refrigerator.
    • Once baked, the key lime pie can be stored in the refrigerator for a few days before finishing and serving.

    Storage information

    Store pie in the refrigerator for up to 3-4 days. Cover the pie loosely with plastic wrap. For presentation purposes, wait to top your pie with whipped cream until the day you plan to serve it or right before serving. Then topped with whipped cream.

    Keto Key Lime Pie: FAQS

    Can I make this pie with regular limes instead of key limes?

    Yes, you won't have to use as many limes. Since regular limes are larger than key limes, you will only need about 3-4 limes to get 1/2 cup of lime juice for this recipe.

    Can I freeze this pie?

    I'm not sure the texture will turn out the same as if you served it fresh, so I don't recommend freezing this pie.

    Are limes keto?

    Yes, limes are keto approved. The sugar content in limes are very low.

    Nutritional information & Macros

    Nutrition Information

    Keto Key Lime Pie

    Servings: 8

    Amount Per Serving
    Calories 578
    Fat 55g
    Protein 7g
    Total Carbs 7.9g
    Net Carbs 5.4g

    Other Keto Dessert Recipes

    Slices of cinnamon coffee cake on parchment paper.
    45 Mins
    Keto Cinnamon Roll Coffee Cake

    All the flavors of a cinnamon roll mixed into a coffee cake yet made low carb and gluten-free! Only 1.7 carbs per slice!

    See the Recipe
    A slice of no-bake cheesecake on a plate covered with raspberry sauce and whole fresh raspberries.
    40 Mins
    Keto Raspberry No-Bake Cheesecake

    Effortlessly, luscious no-bake keto cheesecake boasting a silky smooth texture and perfectly complemented with a homemade sugar-free raspberry sauce...

    See the Recipe


    1. I have learned so much from you Annie oh, you’ve made a big difference in my life. I follow you everyday and enjoy all your videos everybody in my family loves your recipes thank you my dear!

    2. The prep output looked great . Then when I baked the pie crust it melted, and never cooked. I used oat flour instead of almond , And it went down hill from there :(.
      I also couldn’t get the pie texture right , too liquidity.

      1. I’m not sure how well that will work. It might work just fine, but the acid from the lime juice works with the egg yolks to solidify and thicken the pie when baked.

    Leave a Reply

    Your email address will not be published. Required fields are marked *