Keto Key Lime Pie


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This cool and creamy keto key lime pie is the perfect treat for a hot day! I’ll show you how to make a sugar-free key lime pie with simple ingredients and just a few minutes of prep time.

If you like the flavor of keto lemon meringue pie, you’ll love this sweet and tart alternative. I also have a no bake version in the Wholesome Yum app.

A super smooth low carb key lime pie needs a sweetener that dissolves easily! That’s why I use Besti Powdered Monk Fruit Allulose Blend for this dessert. Since it measures and tastes like sugar, nobody can tell that this pie is keto friendly… and with a fine consistency, every bite stays creamy. Pair it with a buttery crust using Wholesome Yum Almond Flour, and you’ll never miss conventional key lime pie again!

Keto key lime pie next to bags of Besti Powdered Monk Fruit Allulose Blend and Wholesome Yum Almond Flour.

Is Key Lime Pie Keto?

Most key lime pie recipes are not keto friendly, since they contain refined sugar, conventional sweetened condensed milk, and a traditional graham cracker crust with gluten. However, it’s easy to swap these ingredients to make a recipe for sugar-free key lime pie that tastes just as delicious!

Why You’ll Love This Keto Key Lime Pie Recipe

  • Sweet and tangy flavor
  • Cool, creamy texture
  • Uses basic keto ingredients
  • Low carb and gluten-free
  • Just 5 grams net carbohydrates per slice
  • Mouthwatering summer dessert!
Slice of keto key lime pie on a plate next to limes.

Ingredients You’ll Need

This section explains how to choose the best ingredients for sugar-free key lime pie, what each one does in the recipe, and substitution options. For measurements, see the recipe card below.

  • Almond Flour Pie Crust – You can also use coconut flour pie crust for a nut-free variation.
  • Sugar-Free Sweetened Condensed Milk – Helps make the creamy consistency, and it’s easy to make yourself! You may be able to make a dairy-free version if you need to by using coconut cream or full-fat coconut milk instead of heavy cream.
  • Egg Yolks – Help the key lime pie filling “set” and adds to the rich and smooth mouthfeel.
  • Besti Powdered Monk Fruit Allulose Blend – This one dissolves the best and tastes the most like sugar, all with 0g net carbs. To use other powdered sweeteners, check the conversions in my keto sweeteners guide. However, many other brands have erythritol in them and have a tendency to crystallize when storing, so the texture may be gritty if not using Besti.
  • Key Lime Juice – Get a bottled version like this for convenience, or squeeze your own limes. You can use regular or key limes for this juice.
  • Lime Zest – Adds extra lime flavor with minimal extra carbs.
  • Sea Salt – Balances the tart and tangy sweetness.
  • Optional Garnishes – Thinly sliced fresh limes and sugar-free whipped cream.
Keto key lime pie ingredients.

How To Make Sugar-Free Key Lime Pie

This section shows how to make keto friendly key lime pie, with step-by-step photos and details about the technique. For full instructions, see the recipe card below.

  1. Make condensed milk. Prepare the sugar-free condensed milk (be sure to double the recipe) and set aside to cool.
  2. Make the crust. Prepare the almond flour pie crust and set aside to cool.
Keto sweetened condensed milk in a pan next to bag of Besti.
Almond flour pie crust.
  1. Make filling base. In a medium bowl, use a mixer or whisk to combine condensed milk and egg yolks until smooth.
  2. Add lime. Add key lime juice and lime zest, whisking until smooth. Taste the filling and whisk in Besti, if desired, until it reaches your desired sweetness.
Whisked eggs and condensed milk in a bowl.
Sugar-free key lime pie filling in a bowl with whisk.
  1. Pour. Pour filling into the cooled crust. Smooth the top and cover edges with foil or a pie shield.
  2. Bake. Bake keto key lime pie for 15 minutes.
TIP: Pie will still look runny.

TIP: Pie will still look runny.

The filling will not completely set until it sits in the fridge for 3-4 hours.

Unbaked pie with foil around edges.
Baked sugar-free key lime pie without garnishes.
  1. Chill. Cool for 30 minutes on the counter, then refrigerate until set.
  2. Garnish. Top with lime zest, keto whipped cream, and lime (or key lime) slices.
Overhead view of whole keto key lime pie.
Tips For The Best Keto Key Lime Pie

Tips For The Best Keto Key Lime Pie

Make and serve this pie easily with a few key tips:

  • Don’t skip the chilling time. Otherwise the pie will be too runny and hard to cut.
  • Make clean slices. Use a sharp knife to cut the pie, wiping it clean between slices.
  • Serve it soon. For best results, serve the pie within 24 hours of making it. The crust can be made ahead, but once the filling is added, the crust has the best texture within the first 24 hours after it sets.

Storage Instructions

  • Store: Keep leftovers covered in the fridge for 1-2 days.
  • Freeze: To freeze pie, divide into slices and freeze individually until solid. Then wrap tightly for long term freezer storage for up to 1 month.
Sugar-free key lime pie with Besti sweetener.

More Keto Pie Recipes

Try these cool and summery pies next — all with no sugar whatsoever.

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Ingredients

Tap underlined ingredients to see where to get them. Please turn Safari reader mode OFF to view ingredients.

Instructions

Tap on the times in the instructions below to start a kitchen timer while you cook.

  1. Preheat the oven to 350 degrees F (176 degrees C).

  2. Make the keto pie crust according to the instructions here. Set aside to cool. Leave the oven on at 350 degrees F (or preheat again before step 6).

  3. Meanwhile, in a medium bowl, whisk together the condensed milk, egg yolks, and salt, until smooth.

  4. Whisk in the lime juice and lime zest, until smooth.

  5. Taste the filling to see if it’s sweet enough to your liking. If not, whisk in Besti Powdered, until dissolved, to achieve your desired sweetness.

  6. Pour the filling mixture into the cooled crust and smooth the top. Cover the edges of the crust with foil or a pie shield.

  7. Bake the keto key lime pie for 15 minutes. The filling will still be runny and will not set at this step – this is normal.

  8. Remove the pie from the oven. Cool for 30 minutes on the counter, then refrigerate for at least 3-4 hours, until set. Serve cold or at room temperature.

Recipe Notes

Serving size: 1 slice, or 1/12 entire recipe

Nutrition Facts

Amount per serving. Serving size in recipe notes above.

Calories 526

Fat 54.5g

Protein 8.9g

Total Carbs 8g

Net Carbs 5g

Fiber 3g

Sugar 3g

Nutrition facts are provided as a courtesy. Have questions about calculations or why you got a different result? Please see our nutrition policy.

© Copyright Maya Krampf for Wholesome Yum. Please DO NOT SCREENSHOT OR COPY/PASTE recipes to social media or websites. We’d LOVE for you to share a link with photo instead. 🙂

Keto key lime pie recipe pin.





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