Published: May 30, 2024 · Modified: Jun 24, 2024 by Carolyn

Keto Butter Tarts

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These keto butter tarts are the real deal! Tender grain-free pastry with a rich, gooey caramel custard center. The famous Canadian dessert made low carb and sugar free.

Keto Butter Tarts in a stack on a white wooden table.

This one goes out to my fellow Canucks, because only they can truly understand how momentous this recipe for Keto Butter Tarts really is.

But even if you’re not Canadian, even if you don’t have a single drop of Canadian blood, I suggest you stick around. Chances are that many of you have never heard of butter tarts, but they are worth getting to know!

Along with my Keto Nanaimo Bars, these sweet custard tarts have a very special place in my heart. They remind me of my childhood. They remind me of my father. And to re-create them in a healthier way brings me great joy.

Top down image of freshly baked keto butter tarts in the pan.

Why you must try this recipe

If ever there was a national food of Canada, butter tarts are it. There are other uniquely Canadian dishes but these treats are loved and appreciated nationwide. In my home province of Ontario, there are even butter tart festivals and bake-offs, with everyone and their mother claiming they have the best recipe.

At their best, butter tarts are made of tender, flaky pastry with an incredibly gooey, sweet custard filling that usually contains raisins or dried currants. The filling is similar to pecan pie but even more gooey. So gooey that it should ooze out all over your face as you take a bite.

Traditional butter tarts are the stuff of a low carb dieter’s nightmares. They are made with copious amounts of brown sugar and corn syrup, and a large one can come in at a whopping 84g of carbs. Yikes!

Never one to resist a challenge, I simply had to create a keto recipe. I used the pastry from the Mini Keto Quiche, which holds together well. The filling uses a slightly sweeter version of my Keto Caramel Sauce but with some allulose to make it extra gooey. I also deliberately under-baked them, taking them out of the oven when the very center still looked a little wet. It was perfect!

Reader Reviews

“I made your keto butter tarts yesterday!! They are absolutely amazing!! I learned to love them as a kid, vacationing in Muskoka!! Thank you so much for creating this wonderful keto version of these beloved butter tarts!! – Susan W.

“This is one of those recipes that I can’t make too often!! If I do then I’m in serious trouble!! Talk about addicting!!! This is one of my absolute favorite recipes hands down!!!” — Lois M.

“I was skeptical but O.M.G. THESE ARE AMAZING!! I didn’t have heavy whipping cream, so I used coconut milk in its place and they still turned out fantastic. Taste even better the next day, cold from the fridge. 😀 Thank you, thank you, thank you! I’ve been craving butter tarts and these are spot on!” — Jane A.

Ingredients you need

Top down image of ingredients needed for keto butter tarts.

Almond flour: Almond flour is the best option for the crusts. If you really need to be nut-free, you can try sunflower seed flour. Keep in mind that it will affect the appearance and flavor of the tarts.
Sweeteners: For the best consistency, you need several different sweeteners. The crust takes a powdered erythritol sweetener such as Swerve. The keto caramel filling needs brown sugar replacement as well as some allulose or BochaSweet to have a gooey consistency.
Xanthan gum: This ingredient helps gluten-free baked goods have a bit more structure. I don’t use it often, but it helps with things like this tart crust.
Eggs: You will need eggs for both the crust and the filling.
Butter: You can’t have butter tarts without butter! Use unsalted so that your tarts don’t turn out too salty.
Heavy cream: This helps create a rich, silky caramel sauce for the filling.
Caramel extract: I like to use caramel flavor in the filling to really boost it. But you can also use vanilla extract.
Raisins or chopped nuts: Raisins are quite high in carbs, so I only use 2 tablespoons and chopped them up. But you can also use chopped walnuts or pecans.

Basic steps

A collage of 6 images showing the steps for making keto butter tarts.

1. Make the pastry: In a large bowl, whisk together the almond flour, sweetener, xanthan gum, and salt. Stir in the egg and butter until a cohesive dough forms. Split the dough into two portions.

2. Cut out the crusts: Dust a work surface lightly with more almond flour and transfer one portion of dough to the work surface. Cover with waxed paper or parchment paper and roll out to an even ⅛” thickness. Use a 3 ½ inch cookie cutter to cut out as many circles as possible. Repeat with remaining dough.

3. Bake the crusts: Use an offset spatula to carefully lift each crust off the work surface. Press the crusts carefully down into lightly greased muffin cups. Bake the crusts 12 minutes at 325ºF, then remove and let cool completely to firm up.

4. Make the caramel sauce: Combine the butter and sweeteners in a medium saucepan over medium heat. Bring to a boil and cook 3 to 5 minutes, watching carefully to make sure it doesn’t burn. Remove from heat and add the heavy cream and caramel extract. (The mixture will bubble vigorously, this is normal). Sprinkle the surface with the xanthan gum and whisk vigorously to combine. Whisk in the salt.

5. Fill the shells: Let the mixture cool to lukewarm, about 10 minutes. Once cooled, whisk in the egg. Divide the chopped raisins or pecans among the tart shells and spoon the filling over top. Fill each crust almost all the way to the top.

6. Bake the tarts: Bake 15 to 22 minutes, until the tart edges are golden and the filling is mostly set with a little jiggle in the center (it should still look a little wet in the very center of each tart). Remove from oven and let cool completely, then use a knife to loosen each tart.

A keto butter tart broken open with the filling oozing out.

Expert tips

Tips for keto pastry crust

Use a non-stick metal muffin pan and grease it lightly, to avoid sticking.
Dust your work surface with a little more almond flour. This helps the pastry rounds release more easily. Wiggling a small offset spatula under the rounds also helps.
Cut the circles about 3 ½ inches in diameter. A cookie or biscuit cutter works well, but if you don’t have one the right size, try a round drinking glass or plastic container.
Bake the crusts empty first, to allow them to brown and crisp a little bit before adding the custard filling.

Tips for butter tart filling

This uses a sweeter, thicker version of my Keto Caramel Sauce. But this time I used some allulose to really get a gooey center. BochaSweet and xylitol would be the best substitutes. If you use all erythritol based sweeteners like Swerve or Lakanto, your filling will recrystallize some as it cools.
Let the sauce cool to lukewarm before adding the egg. Otherwise it will cook the egg and your filling will curdle.
For truly gooey butter tarts, remove them from the oven when the very center of the tarts still look a little wet. They will continue to firm up a bit as they cool.

Three keto butter tarts on a plate over a red napkin with a cup of coffee in the background.

Recipe FAQs

What is butter tart filling made of?

Classic butter tarts are made with brown sugar, corn syrup, eggs, and butter. But these keto butter tarts are made with my popular sugar-free caramel sauce, which replaces both the brown sugar and the corn syrup.

How many carbs are in a keto butter tart?

This keto butter tart recipe has 5.2g of carbs and 1.8g of fiber per serving. That comes to 3.4g net carbs per tart.

How do you store keto butter tarts?

These tarts are best served within a few days, as they lose their gooeyness as they sit. I recommend storing them in an airtight container on your counter.

Keto Butter Tarts on a plate over a white wooden table.

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Keto Tiramisu Tart

Tiramisu lovers, this delectable keto tart recipe is for you! With a tender crust, a rich chocolate ganache, and creamy mascarpone topping, it's a low carb dessert worthy of any occasion.

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Keto Caramel Tart Recipe

This Keto Salted Caramel Tart with a cookie crust is going to make you swoon! It's the perfect mash-up of decadent sugar free desserts. And each serving has only 3.1g net carbs!

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Close up shot of a slice of keto caramel tart with the caramel sauce oozing out.

Keto Butter Tarts

These keto butter tarts are the real deal! Tender grain-free pastry with a rich, gooey caramel custard center. The famous Canadian dessert made low carb and sugar free.

4.87 from 36 votes

Print Pin Rate

Course: Dessert

Cuisine: Dessert

Keyword: keto butter tarts

Prep Time: 40

Cook Time: 25

Total Time: 1 5

Servings: tarts

Calories: 191kcal

Equipment

3½ inch cookie cutter

Ingredients

Pastry

1 ¾ cups almond flour
3 tablespoon Swerve Confectioners
½ teaspoon xanthan gum
¼ teaspoon salt
1 large egg
3 tablespoon butter melted

Filling

¼ cup butter unsalted
⅓ cup Swerve Brown
⅓ cup allulose (or BochaSweet)
½ cup heavy whipping cream
½ teaspoon caramel extract (or vanilla extract)
¼ teaspoon xanthan gum
⅛ teaspoon salt
1 large egg room temperature
2 tablespoon raisins, chopped (or chopped pecans or walnuts)

US Customary – Metric

Instructions

Pastry

Preheat the oven to 325ºF and lightly grease a non-stick muffin pan.
In a large bowl, whisk together the almond flour, powdered sweetener, salt, and xanthan gum. Stir in the egg and melted butter until the dough comes together. Split the dough into two portions.
Dust a work surface lightly with more almond flour and transfer one portion of the dough to the work surface. Cover the dough with waxed paper or parchment paper and roll out to an even ⅛" thickness.
Cut out into 3½ inch circles (cookie or biscuit cutters work, as does a drinking glass). Use an offset spatula to carefully lift each crust off the work surface.
Press the crusts carefully down into the prepared muffin cups. If they crack at all, use a little extra dough to patch the crack.
Repeat with the other half of the dough, then gather the scraps and re-roll get more circles. You should be able to get at least 12 crusts.
Bake the crusts 12 minutes, then remove and let cool completely to firm up.

Filling

Combine the butter and sweeteners in a medium saucepan over medium heat. Bring to a boil and cook 3 to 5 minutes, watching carefully to make sure it doesn't burn.
Remove from heat and add the heavy cream and caramel extract. (The mixture will bubble vigorously, this is normal). Sprinkle the surface with the xanthan gum and whisk vigorously to combine. Whisk in the salt.
Let cool to lukewarm, about 10 minutes. Once cooled, whisk in the egg.
Divide the chopped raisins or pecans among the tart shells and spoon the filling over top. Fill each crust almost all the way to the top.
Bake 15 to 20 minutes, until the tart edges are golden and the filling is mostly set with a little jiggle in the center (it should still look a little wet in the very center of each tart).
Remove from oven and let cool completely, then use a knife to loosen each tart.

Video

Nutrition Facts

Keto Butter Tarts

Amount Per Serving (1 tart)

Calories 191 Calories from Fat 153

% Daily Value*

Fat 17g26%

Carbohydrates 5.2g2%

Fiber 1.8g7%

Protein 4.4g9%

* Percent Daily Values are based on a 2000 calorie diet.

Please note that I am not a medical or nutritional professional. I am simply recounting and sharing my own experiences on this blog. Nothing I express here should be taken as medical advice and you should consult with your doctor before starting any diet or exercise program. I provide nutritional information for my recipes simply as a courtesy to my readers. It is calculated using MacGourmet software and I remove erythritol from the final carb count and net carb count, as it does not affect my own blood glucose levels. I do my best to be as accurate as possible but you should independently calculate nutritional information on your own before relying on them. I expressly disclaim any and all liability of any kind with respect to any act or omission wholly or in part in reliance on anything contained in this website.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

Comments

4.87 from 36 votes (2 ratings without comment)

Keto Butter Tarts

Why you must try this recipe

Reader Reviews

Ingredients you need

Basic steps