Keto Key Lime Pie With Almond Flour Crust

If you love a creamy, tart, and refreshing dessert, this keto key lime pie is going to be a favorite. It has all the bright lime flavor we expect from a classic key lime pie, but without the sugar and high-carbs.

Living in South Florida, key lime pie is one of those desserts that feels extra special. It's tangy, cool, and perfect for warm weather, family gatherings, holidays, or anytime you want a low-carb dessert that tastes like a treat.

This version features a buttery almond flour crust, a silky cooked lime custard filling, and a lightly sweetened whipped cream topping that gets piped once the pie is fully set.

It's a sugar-free key lime pie that's also gluten-free, low in carbs, and made with simple keto-friendly ingredients.

The best part is that it can be made ahead of time, which makes it a great dessert for entertaining.

I have an entire collection of keto pie recipes you may want to check out.

Why You'll Love This Keto Key Lime Pie

This low-carb key lime pie gives you that classic creamy, tangy flavor while keeping the carbs low.

It's a great recipe to make when you want something bright and refreshing but still rich enough to satisfy your sweet tooth.

Here's why this recipe works so well:

• It's sugar-free and keto-friendly
• It has a gluten-free almond flour crust
• It uses fresh key lime juice or Persian lime juice
• It's naturally gluten-free
• The filling has the perfect balance of creamy and tart.
• It can be made ahead of time
• It's perfect for spring, summer, holidays, and special gatherings

Since the filling needs time to chill and set, this is a wonderful dessert to prepare the day before you plan to serve it.

A Sugar-Free Key Lime Pie That Makes Keto A Delicious Breeze

Traditional key lime pie is usually made with sweetened condensed milk and a graham cracker crust. While delicious, that combination is loaded with sugar and carbs.

This keto version skips the condensed milk and uses a rich custard-style filling made with egg yolks, heavy cream, fresh lime juice, butter, and a granulated sugar substitute.

The result is a creamy, tangy filling that still gives you that classic key lime pie flavor, without the sugar crash.

The almond flour crust replaces the graham cracker crust and gives the pie a buttery, slightly nutty base that pairs beautifully with the bright lime filling.

Ingredients Needed For Low-Carb Key Lime Pie

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The following is a list of ingredients you will need to bake your key lime keto pie:

• Almond Flour Crust: For the crust, you'll need finely milled almond flour, a granulated sugar substitute, sea salt, and melted unsalted butter. The crust is simple to make and bakes until lightly golden. Be sure to let it cool before adding the filling.
• Keto Key Lime Pie Filling: The filling is made with egg yolks, granulated sugar substitute, heavy whipping cream, fresh key lime juice or Persian lime juice, sea salt, unsalted butter, vanilla extract, and fresh lime zest. The fresh lime zest is important because it gives the pie an extra pop of citrus flavor.
• Whipped Cream Topping: The topping is made with softened cream cheese, cold heavy cream, granulated sugar substitute, and a pinch of sea salt. The small amount of cream cheese helps stabilize the whipped cream so it holds its shape better when added to the pie.

Key Lime Juice vs. Persian Lime Juice

Fresh key lime juice gives this pie its traditional flavor. Key limes are smaller and tend to have a more tart, floral flavor.

That said, Persian limes are much easier to find in most grocery stores and work beautifully in this recipe. They still give the pie a bright, fresh lime flavor.

So, use fresh key lime juice when you can, but do not let that stop you from making this recipe. Persian lime juice is a great option.

For the best flavor, I recommend using fresh lime juice instead of bottled whenever possible.

How To Make Keto Key Lime Pie

This recipe has three main parts: the almond flour crust, the key lime filling, and the whipped cream topping.

Make The Almond Flour Crust

Start by preheating the oven. Then, combine the almond flour, sugar substitute, and sea salt in a small bowl.

Add the melted butter and stir until the mixture looks like wet sand.

Press the crust mixture into a 9-inch pie dish, making sure it is evenly pressed across the bottom and up the sides. I like using the bottom of a metal measuring cup to help press the crust evenly into the pie plate.

Bake the crust until it is lightly golden brown, then set it aside to cool completely before adding the filling.

Make The Keto Key Lime Filling

The filling is cooked gently using a double boiler. This helps keep the egg yolks from scrambling and gives you a smooth, creamy texture.

Fill the bottom pot of your double boiler with a small amount of water and bring it to a gentle simmer. If you do not have a double boiler, place a heatproof bowl over a saucepan of simmering water.

Just be sure the bottom of the bowl does not touch the water.

In the top pot or heatproof bowl, whisk together the egg yolks, sugar substitute, heavy cream, lime juice, and sea salt.

Cook the mixture over medium heat, whisking constantly, until the custard thickens and coats the back of a spoon.

Once thickened, remove it from the heat and whisk in the butter, vanilla extract, and fresh lime zest.

Transfer the filling to a clean bowl, then place that bowl into a larger bowl filled with ice. Whisk until the filling cools down.

Once cooled, spread the filling into the cooled almond flour crust.

Cover the pie and refrigerate it for at least 4 hours, or overnight, until fully set.

Add The Whipped Cream Topping

Once the pie has fully set in the refrigerator, make the whipped cream topping.

Beat the softened cream cheese, sugar substitute, and sea salt until smooth. Add the cold heavy cream and continue beating until medium peaks form.

Pipe the whipped cream topping around the edge of the pie before serving.

Tips For The Best Keto Key Lime Pie

For the smoothest filling, whisk constantly while cooking the custard. This is not the time to walk away from the stove.

Be sure the water in the double boiler is simmering gently, not boiling aggressively. Too much heat can cause the egg yolks to scramble.

Allow the almond flour crust to cool completely before adding the filling. Adding warm filling to a warm crust can affect how the pie sets.

Do not skip the chilling time. The pie needs at least 4 hours in the refrigerator so the filling can firm up properly.

For the prettiest presentation, add the whipped cream topping after the pie has fully chilled and set.

Can I Make This Pie Ahead Of Time?

Yes, this keto key lime pie is a great make-ahead dessert.

In fact, I recommend making it the day before you plan to serve it. This gives the filling plenty of time to chill and set.

You can make the pie and keep it covered in the refrigerator overnight. Then, add the whipped cream topping shortly before serving.

How To Store Keto Key Lime Pie

Store the pie covered in the refrigerator for up to 5 days.

Because this is a cream-based pie, it should be kept chilled until ready to serve.

I do not recommend leaving it out at room temperature for long periods of time, especially if serving it outdoors or during warm weather.

Can You Freeze Keto Key Lime Pie?

I do not recommend freezing this keto key lime pie because it can affect the texture of the custard filling.

Since the filling is made with egg yolks, heavy cream, and butter, freezing and thawing may cause it to become grainy, watery, or separate.

For the best flavor and texture, store the pie covered in the refrigerator and enjoy it within 5 days.

If you are making this pie ahead of time, I recommend preparing it the day before and adding the whipped cream topping once the pie has fully set.

What Sugar Substitute Works Best?

For this recipe, I recommend using a granulated sugar substitute that measures cup-for-cup like regular sugar.

A monk fruit and erythritol blend, allulose blend. Check out our keto sweetener guide for a more detailed explanation.

More Keto Key Lime Recipes

This keto key lime pie is proof that you can enjoy a classic dessert while staying low-carb. It's bright, creamy, tangy, and just sweet enough to feel like a special treat.

If you are looking for a sugar-free key lime pie that does not feel like a compromise, this one is a must-try.

Below are more keto key lime recipes to try soon!

• Keto Key Lime Pound Cake
• Keto No-Bake Key Lime Cheesecake
• Keto Key Lime Cheesecake Bars
• Keto Key Lime Fat Bombs

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