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.
Do you want to see everyone at your table sink into silence, occasionally interrupted by a contented sigh? Serve this low carb chocolate cake and watch the magic happen.
Table of contents
- Low carb chocolate cake essentials
- How to make Keto chocolate cake
- Recipe tips
- Flavour and Recipe Variations
- Toppings for this keto cake
- Make a layer cake
- More decadent keto desserts with chocolate
I love all the recipes I post on this site, but this 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!
Low carb chocolate 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.
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
- Almond flour
...and a pinch of salt.
Shall we get straight to the recipe?
How to make Keto chocolate cake
(This section contains step by step instructions and photos that show how to make this recipe. Find the recipe card with ingredient amounts and nutritional information at the bottom of the post.)
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.
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.
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.
4.) See how it's slowly coming together?
5. And this is how it should look like - gooey, creamy goodness!
6.) Lastly, you add the almond flour / ground almonds and stir until they are evenly distributed.
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.
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.
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 teaspoon 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 teaspoon of baking powder or ½ teaspoon 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 this keto 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 tablespoon of double / heavy cream and 4 tablespoon 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 tablespoon 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.
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.
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 cake. Simply defrost it in the fridge for 48 hours or on the counter for 24 hours.
More decadent keto desserts with chocolate
- Fudgy Chocolate Avocado Cake (Sugar Free)
- Sugar Free Low Carb Chocolate Birthday Cake
- Keto Chocolate Donuts
- Really Simple Low Carb Chocolate Tart
- Sugar Free Chocolate Cupcakes
Tried this sugar free cake recipe? Give it a star rating below!
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Best Ever Keto Chocolate Cake (Sugar Free)from Sugar Free Londoner
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.
- 300 g / 10.5 oz unsweetened chocolate ***see notes
- 300 g / 10.5 oz butter unsalted (1 ⅓ cup melted)
- 6 eggs
- ½ cup / 50g almond flour or ground almonds
- 1 cup / 150g powdered erythritol
- pinch of salt
- 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.
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First published in November 2018. Updated and republished in June 2022.
I would like to thank you for your recipe, though it was not a Chocolate Cake I expected. Luckily I had read through the comments as well, and there was no disappointment when the cake came out of the oven. I am not sure I would make it again, but my hubby loved it, especially when I put a slice in the microwave for a few seconds and it was similar to a brownie. Very rich and heavy, but pure chocolate as you all can imagine. I def had to bake it much longer, but that s just a side comment. Thanks again!!! BTW I added a cream cheese topping, it fit perfectly!
I am glad the recipe was a success. It sounds like you prefer a more traditional cake where the texture is lighter and fluffier. I think you would like my chocolate birthday cake.
Mine is in the oven right now. I used a 7" springform and not really sure how long to bake it. Hoping for the best on this one. The batter tasted awesome. Keeping my fingers crossed I don't screw this up!
Hi dear, thanks for sharing… before I go and try this chocolate keto sugar free cake, could I use egg whites instead of the entire 6 eggs? Or reduce the eggs and mix with the egg whites? Thank you, I can’t wait to try it :)!
Yes, absolutely, the yolks are not essential for the recipe.
Hi just an enquiry with a fan assisted oven what temperature do you recommend?
150 Celsius or 300F.
Thank you. It is a scrumptious cake. When it was a couple of days after making I tried a slice warmed up in the microwave for 30 seconds it was so delicious.
I will be making this keto sugar free, cake. I want to know if I should use 100% cacao in powder , chips or solid form? Does it make a difference when I add the butter and melt it?
I used chocolate, not cacao powder. I explain it all in the post 🙂
Hey, this is the best chocolate cake I’ve ever had! I make it a lot. I slice it up into 16 pieces, wrap them in glad wrap and freeze them. They taste even more delicious when frozen. Thanks for this recipe ❤️❤️❤️
Hits the spot for a sumptuous chocolate experience without the piling on of calories. Enjoy!
Lots of recipes claim to be the 'best Keto' chocolate cake ever' however, this one truly is! Thanks so much!
Can you bake it in a silicon pan?
Of course! If it is a different shape you may need to adjust the oven time a little. As a rule of thumb, the flatter the cake is, the quicker it will bake. If it is taller, it will take longer for the heat to penetrate the centre and cook.
Thank you for sharing your recipe
May I ask can the butter be substituted for apple sauce, banana or additional eggs?
There are plenty of eggs in the recipe. I don't think you need any more. You could definitely try replacing some of the butter with apple sauce or banana.
This sounds amazing! Could I swap the almond flour for coconut flour? My husband has an almond allergy so I try to find recipes we can both enjoy.
You could try to replace it with either 1/3 the amount of coconut flour (coconut flour is more absorbent and you'll need less) or use a 50/50 blend of sunflower seed flour and sesame seed flour (totalling the same amount as almond flour).
Well that's the first time I've ever seen a baking at altitude instruction.
And given that I live at 1900m, it was appreciated.
But whatever made you think to include it? London's not notoriously high.
I have readers all over the world and it's a question that comes up now and then. So, I decided to answer it in the post.
In the Rockies in Western US and this is the first time I've seen an adaptation for altitude in a from-scratch recipe, let alone a specialty recipe like keto/gluten free. Thanks for that small consideration. 4 minutes till it comes out of the over, but the batter was delicious!
Made this cake for my husband’s birthday, it’s delicious yet really easy to make. It’s feels very indulgent and a little goes a long way. I did the chocolate layer cake version and made the chocolate ganache frosting. Unfortunately it split but luckily rescued it by whisking in some room temperature milk. Finished off with raspberries on the top, served with a drop of cream - such a treat!
That sounds delicious!
This cake is delicious. I preferred eating the slices when they were frozen. There’s a lot of butter in the recipe and I’m wondering if I could use less butter, 150gm or 200gm with the other full ingredients listed in the recipe? Not sure if it would still taste ok, but the butter concerns me. Thanks
You can definitely try with less butter and see how it works. Maybe replace it with some liquid such as almond milk?
Worked beautifully. I added a couple more tablespoons of almond flour and some pure vanilla extract and orange extract. Really deepened the flavour. Whipped cream topping instead of cocoa powder.
Can you use Monkfruit instead?
Any powdered sweetener works, as long as it's a 1:1 sugar replacement. Most monk fruit sweeteners I have coma across are a blend of erythritol and monk fruit anyway.
Hi, I have Ghirardelli’s baking Dutch cacao powder, can that be used?
Hi Kari, you really have to use a chocolate bar, otherwise the fat content of this recipe is off. You can, however, use this chocolate cake recipe instead - it uses cocoa powder instead.