Best Ever Keto Chocolate Cake (Sugar Free)

Must Try

This 5 ingredient keto chocolate cake is the pinnacle of sugar free desserts! It is incredibly moist, rich and packed with chocolate flavor. Even better, it has only 2.5 net carbs per slice.

a slice of chocolate cake on a plate

Do you want to see everyone at your table sink into silence, occasionally interrupted by a contented sigh? Serve this sugar free cake and watch the magic happen.

I love all the recipes I post on this site, but this sugar free chocolate cake recipe is special. That’s because it’s more than just a chocolate cake. It’s a crazy good, wonderfully rich Keto chocolate cake.

This Keto cake does nothing by halves. It contains as much chocolate as it can possibly handle, a generous amount of grass-fed butter and it is just on the right side of sweet. Basically, it is a Keto dream dessert.

It will satisfy the cravings of any chocolate lover. And it also makes a great gluten-free birthday cake!

Sugar free cake essentials

There are 2 ingredients that increase carbs and sugar in a traditional cake: the wheat flour and, of course, the sugar.

As grains are a no-no on a Keto diet (as well as on a sugar free / low carb diet), most Keto cake recipes use either almond flour or coconut flour or both. This cake uses only a very small amount of almond flour, which makes it super fudgy, almost like a brownie.

And of course, I’m using a sugar substitute in place of sugar. For this cake, I’ve chosen an erythritol/stevia blend. Erythritol is a polyol and cannot be absorbed by our body. Therefore, it’s essentially zero carb and does not raise blood sugars. Read more about polyols here.

You can replace the erythritol in this recipe with xylitol, monk fruit sweetener, allulose or with Splenda. If you’re using Splenda, be sure to measure using cups as it’s lighter in weight than erythritol. And if you’re using xylitol, keep it away from dogs. It’s highly toxic to them!


It’s hard to believe, but you only need 5 ingredients to make this cake:

  • Unsweetened chocolate
  • Eggs
  • Sweetener
  • Almond flour
  • Butter

…and a pinch of salt.

Shall we get straight to the recipe?

How to make Keto chocolate cake – step by step:

Eggs in a bowl with a mixer

1.) Whisk the eggs with a hand mixer in a large mixing bowl until they have doubled in size and are frothy.

You want to make sure that the eggs are ROOM TEMPERATURE. If you forgot to take them our 30 minutes before starting on the cake, you can always warm them up in a bowl with hot water.

Keeping the eggs at room temperature prevents the mix from splitting and becoming lumpy once you add the warm chocolate and butter.

whisked eggs and sweetener for Keto cake

2.) Add the powdered erythritol and whisk again until well-combined.

Tip: If you only have granulated sweetener, blitz it in a food processor or with the attachment of a stick blender to turn it into a powder. You don’t want any crunchy bits in your gooey, moist chocolate cake!

TASTE the cake batter and add more sweetener if necessary. I don’t have much of a sweet tooth, so you may prefer it a little sweeter than I do.

Adding the melted chocolate to the Keto cake batter

3.) Melt butter and chocolate and stir until combined. You can do this in a microwave or on the stove – but slowly and gently. TAKE YOUR TIME!!! If the chocolate gets too hot too quickly, it can seize or separate.

Then add the mix to the bowl and fold it in with a spatula or spoon.

Mixing the batter

4.) See how it’s slowly coming together?

the chocolate cake batter is coming together

5. And this is how it should look like – gooey, creamy goodness!

Adding almond flour to the chocolate cake mix

6.) Lastly, you add the almond flour / ground almonds and stir until they are evenly distributed.

cake batter in a springform

7.) Get yourself a springform pan (I used a 20 cm / 8 inch) and line the bottom with parchment paper. Grease the sides with butter or oil and pour in the batter. Bake at 170 Celsius / 340 Fahrenheit on the middle shelf for 30 minutes.

Let the cake cool completely before cutting.

the finished cake on a cake stand

Keto chocolate cake recipe tips 

One thing I absolutely love about this low carb chocolate cake (apart from the taste!) is the fact that the recipe contains only 5 basic ingredients.

This also means that these ingredients MUST be the best possible quality, especially the chocolate.

Best chocolate to use

Here in the UK there are a range of artisan chocolate makers which produce unsweetened chocolate. The brand I used, Montezuma’s, is available at Sainsbury’s, in organic shops or online. In the US you can go for a brand like Ghirardelli.

I don’t recommend choosing unsweetened Baker’s chocolate for this cake. It has the tendency to seize when you melt it and simply does not taste as creamy and mellow as quality chocolate.

The right way to melt chocolate

Which brings me to my second recommendation: Take your time melting the chocolate!

When you melt the butter and chocolate in the microwave, do so in 30 second bursts. Mine was mostly melted after 90 seconds in total. I then left the bowl on the kitchen counter and stirred it from time to time. This caused the rest of the chocolate to melt slowly.

If you don’t have a microwave, you can melt chocolate in a water bath. For this, you either place the bowl with your chocolate and butter in a heat proof bowl over a pot with boiling water. Once the chocolate is half-melted, remove the bowl and let it fully melt by stirring occasionally.

Baking at high altitude

If you are baking at high altitude, increase the oven temperature by 10 Celsius / 25 Fahrenheit.

Cutting a slice of keto chocolate cake

Flavour and Recipe Variations

SPICE IT UP: I think all chocolate desserts benefit from a pinch of salt, although this is entirely optional.

To give your keto cake a festive vibe, you could add 1 tsp vanilla extract, 1 tsp cinnamon plus some cardamom, nutmeg and a pinch of cloves.

For an extra kick, try adding a pinch of chilli! Or grate the zest of 1 orange into the batter.

MAKE IT NUTTY: Add nuts for a bit or crunch – walnuts or pecans would work well.

FLUFFY TEXTURE: This cake is supposed to be fudgy. For a slightly fluffier texture, you could add 1 tsp of baking powder or ½ tsp of baking soda.

I don’t recommend to replace the chocolate with cocoa powder.

DAIRY-FREE: Replace the butter with coconut oil.

NUT-FREE: Use ¼ cup coconut flour in place of the almond flour.

Toppings for sugar free cake

I’m a bit of a purist, so I simply dusted my cake with 100% unsweetened cocoa powder and served on a pretty cake stand.

You could also dust the low carb cake with powdered sweeter.

If you want to go the whole nine yards, make a cream cheese frosting or a buttercream frosting.

Or how about a quick chocolate ganache? Melt 1 bar (100g) of chocolate and stirring in 3 tbsp of double / heavy cream and 4 tbsp powdered sweetener.

You could serve this cake with a dollop of whipped cream or a scoop of sugar free vanilla ice cream.

Keto chocolate frosting

  • Melt 100g / 3.5 oz unsweetened chocolate and 60g / ¼ cup butter
  • Stir in 6 tbsp heavy cream and ⅓ cup / 50g powdered sweetener
  • Wait until the mixture has cooled and thickened, then spread over the cake or slice it horizontally and fill in between the layers.

Make a layer cake

To make a layer cake, either slice the cake in half or split the batter between 2 cake pans. The baking time should be about 25 minutes, but do check after 20 minutes and see if it needs any longer.

Let the layers cool completely, then add the keto chocolate frosting as described above.

a slice of cake dusted with cocoa powder on a plate and a fork

Which cake pan to use

I used a 20 cm / 8 inch springform in this recipe. If you only have a standard size 25 cm / 9 inch springform, your chocolate keto cake will be a little flatter, but it still works fine. You may need to reduce the baking time by 5 minutes. Simply check after 25 minutes if the middle of the cake feels firm to the touch.

How to store keto chocolate cake

Store this sugar free cake in the fridge for 5-6 days. Be sure to keep it in an airtight container. Let the cake come to room temperature before serving.

You can also freeze this Keto chocolate cake. Simply defrost it in the fridge for 48 hours or on the counter for 24 hours.

More decadent keto desserts with chocolate

Tried this sugar free cake recipe? Give it a star rating below!

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Cutting a slice of keto chocolate cake

Best Ever Keto Chocolate Cake (Sugar Free)

from Sugar Free Londoner

The ultimate keto chocolate cake recipe! This decadent, fudgy sugar free cake is really easy to make and requires only 5 ingredients. 

Prep Time 10 mins

Cook Time 30 mins

Total Time 40 mins

Course Dessert

Cuisine British

Servings 12

Calories 389 kcal

Note: The servings slider only changes the first amount in each line and not any subsequent amounts. Please make your own calculations where necessary. ***As an Amazon Associate I earn from qualifying purchases.


  • Heat the oven to 170 Celsius / 340 Fahrenheit. (If you are baking at high altitude, increase the oven temperature by 10 Celsius / 25 Fahrenheit.)

  • Melt the butter and chocolate in the microwave (ca 90 seconds – see notes), then stir and wait until dissolved. Alternatively, gently heat in a water bath (a heat proof bowl placed over a pan of boiling water).  Set aside.

  • In a large bowl, beat the eggs until foamy, then add the sweetener and mix well.  

  • Add the melted chocolate and butter along with the almond flour and stir with a spoon or spatula until just combined.

  • Line the bottom of a 20 cm / 8 inch springform with parchment paper and grease the sides with butter. Pour in the cake batter and bake for approximately 30 minutes on the middle shelf until the top of the cake is firm to the touch, especially in the middle.  

  • Leave to cool before releasing from the cake tin. Once the the cake is completely cooled, dust with cocoa powder. 


2.5g net carbs per slice. Makes 12 slices.
Wait with dusting the cake until it’s completely cooled. If it is still warm, the cocoa powder will melt and become sludgy. 
TAKE YOUR TIME when melting the chocolate. If you overheat it, it can separate into cocoa and cocoa butter and become sludgy. If you melt it in the microwave, break it up as much as possible and heat it in 2 x 30 second bursts, followed by 10 second bursts. Take it out before it’s fully melted and just stir a few times, letting the rest melt on its own.  
***Use GOOD QUALITY butter and chocolate. If your products contain additives such as water or oils, you’ll end up with fat separating and pooling on top of your cake. 
Check out the recipe variations in the post!
Optional chocolate frosting:  Melt 100g / 3.5 oz unsweetened chocolate and 60g / ¼ cup butter, stir in 6 tbsp double / heavy cream and ⅓ cup / 50g powdered sweetener. Wait until it has cooled and thickened, then spread over the cake.
I recommend using an erythritol-based sweetener for best results. If you use a different sweetener use the volume measurements stated as sweeteners vary in density. 


Calories: 389kcalTotal Carbohydrates: 3gProtein: 8.1gFat: 37.8gFiber: 0.5gSugar: 0.3g

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First published in November 2018. Updated and republished in June 2022.

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