This 5 ingredient keto chocolate cake is the easiest fudgy sugar free cake ever! It is incredibly moist, rich and packed with chocolate flavor. Even better, it has only 2.5 net carbs per slice.
![Taking a slice of chocolate cake.](https://sugarfreelondoner.com/wp-content/uploads/2023/04/keto-chocolate-cake.jpg)
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.
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, low carb or not. And it also makes a great gluten-free birthday cake!
Jump to:
Low Carb Cake Essentials
There are 2 ingredients that increase carbs and sugar in a traditional cake: the wheat flour and, of course, the sugar.
What To Use Instead Of Flour
As grains are a no-no on a Keto diet (as well as on a sugar free or 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.
What To Use Instead Of Sugar
I am also 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 is essentially zero carb and does not raise blood sugars.
You can replace the erythritol in this cake and in all keto cake recipes with xylitol, monk fruit sweetener, allulose or with blends such as Swerve. If you're using xylitol, keep it away from dogs. It's highly toxic to them!
Ingredients
It's hard to believe, but you only need 5 ingredients to make this cake:
- Unsweetened chocolate
- Eggs
- Powdered Sweetener
- Almond Flour
- Butter
...and a pinch of salt.
See the recipe card for full information on ingredients and quantities.
Why Quality Ingredients Matter
With such few ingredients, they MUST be the best possible quality, especially the chocolate.
There is 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 quality 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.
Instructions
This section contains step-by-step instructions and photos that show how to make this recipe. See the recipe card for full information on ingredients and quantities
Let me show you how to make a keto chocolate cake in a few simple steps.
![Blending eggs, adding sweetener, mixing in chocolate and stirring batter.](https://sugarfreelondoner.com/wp-content/uploads/2023/04/keto-chocolate-cake-ingredient-steps.jpg)
STEP 1
Whisk the eggs with a hand mixer in a large mixing bowl until they have doubled in size and are frothy and pale.
STEP 2
Add the sweetenerย and whisk again until well-combined.
STEP 3
Melt butter and chocolate and stir until combined. You can do this in a microwave or on the stove - slowly and gently. Slowly add the melted chocolate mixture to the bowl...
STEP 4
... and fold it in with a spatula or spoon.
![Combining chocolate batter and adding almond flour.](https://sugarfreelondoner.com/wp-content/uploads/2023/04/keto-chocolate-cake-ingredient-steps-2.jpg)
STEP 5
Continue stirring until the mixture is fully combined - gooey, creamy goodness!
STEP 6
Lastly, add the almond flour and stir until it is evenly distributed.
![Chocolate cake batter in a springform pan.](https://sugarfreelondoner.com/wp-content/uploads/2023/04/keto-chocolate-cake-batter-in-pan.jpg)
STEP 7
Line the bottom of a springform (I used a 20cm / 8-inch pan) and with parchment paper and grease the sides with butter or oil. Pour in the batter. Bake the cake in the preheated oven until the top of the cake is firm to the touch.
Let the cake cool completely before cutting.
![The finished chocolate cake on a cake stand.](https://sugarfreelondoner.com/wp-content/uploads/2023/04/keto-chocolate-cake-baked.jpg)
Expert Tips
This is what you need to know to make the recipe perfectly.
Tip #1: Room temperature eggs. Take them out 30 minutes before starting on the cake. Or, 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.
Tip #2: Sweetener must be powdered. You don't want any crunchy bits in your gooey, moist chocolate cake!
Blend granulated sweetener it in a food processor or with the attachment of a stick blender to turn it into a powder.
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.
Tip #3: Melt chocolate slowly. This prevents it from splitting and seizing.
Microwave option: 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.
Water bath option: 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.
Recipe Variations
SPICE IT UP: To give your keto cake a festive vibe, add 1 teaspoon of vanilla extract, 1 teaspoonย cinnamon plus 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, add 1 teaspoon of baking powder or ยฝ teaspoon of baking soda.
DAIRY-FREE: Replace the butter with coconut oil.
NUT-FREE: Use ยผ cup coconut flour in place of the almond flour.
![A slice of keto chocolate cake.](https://sugarfreelondoner.com/wp-content/uploads/2023/04/keto-chocolate-cake-slice.jpg)
Toppings
I'm a bit of a purist, so I simply dusted my cake with 100% unsweetened cocoa powder.
You could also dust the low carb cake with powdered sweeter. For both options it is important to wait until the cake is fully cooled. Otherwise, anything you dust on top will melt into an unsightly sludge.
If you want to go the whole nine yards, make the cream cheese frosting from my keto cupcakes or make a buttercream frosting.
You could serve this cake with a dollop of sugar free whipped cream or a scoop of sugar free ice cream.
Recipe FAQs
No. I don't recommend to replace the chocolate with cocoa powder.
To make a layer cake, either slice the cake in half or split the batter between 2 cake pans. The baking time in 2 pans reduces to about 20 minutes.
Let the layers cool completely, then add the keto chocolate frosting as described below.
Yes! Here are the steps:
Melt 100g / 3.5 oz unsweetened chocolate and 60g / ยผ cup butter.
Stir in 6 tablespoons heavy cream and โ
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.
I used a 20 cm / 8-inch springform. With a standard size 25cm / 9-inch springform, your chocolate keto cake will be a little flatter, but it still works fine. Reduce the baking timeย by 5 minutes. In a rectangular loaf pan, the oven time increases by around 15 minutes. As a rule of thumb, the top of the cake must be firm, but the inside still a little jiggly.
Add 2 teaspoons of orange extract to the cake batter. I also recommend trying this chocolate orange cake recipe!
Of course. You can use either 90% dark chocolate or sugar free chocolate chips instead of the unsweetened chocolate. In this case, reduce the amount of powdered sweetener accordingly.
Storage
Refrigerator: Store this keto 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.
Freezer: This cake freezes well. Freeze it pre-sliced for up to 3 months. Simply defrost it in the fridge for 48 hours or on the counter for 24 hours.
More Keto Chocolate Desserts
Here is a selection of sugar free chocolate desserts that we love to make:
- Fudgy Chocolate Avocado Cake
- Sugar Free Chocolate Birthday Cake1 Hours
- Keto Chocolate Donuts23 Minutes
- Keto Chocolate Cheesecake4 Hours 20 Minutes
Tried this recipe? Give it a star rating below!
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Recipe
![a slice of keto chocolate cake](https://sugarfreelondoner.com/wp-content/uploads/2022/06/keto-chocolate-cake-1200-300x300.jpg)
Best Ever Keto Chocolate Cake (Sugar Free)
from Sugar Free LondonerNote: The servings slider only changes the first amount in each line and not any subsequent amounts. Please make your own calculations where necessary.
Ingredients
- 10.5 oz unsweetened chocolate 300g ***see notes
- 10.5 oz butter 300g, unsalted (1 โ cup melted)
- 6 eggs room temperature
- ยฝ cup almond flour 50g, or ground almonds
- 1 cup powdered sweetener 150g
- pinch of salt
Instructions
- 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 (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).ย 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.ย ย
- Leave to cool before releasing from the cake tin. Once the the cake is completely cooled, dust with cocoa powder.
Katrin Nรผrnberger
Do come back here and let me know how it turned out! I love to hear feedback.
Snjeลพana Podvinski
Ja sam radila ฤokoladnu tortu sa naranฤom i ispalo je fantastiฤno
Hvala
Katrin Nรผrnberger
Hello! I put your comment into Google translate and now I know that you turned this cake into keto chocolate cake with orange, which was delicious. This sounds super yum and I am so happy that you enjoyed it!
Deborah Q
There is a recent study that found that Erythritol increases the incidence of heart attack and stroke. As a result I am now using Xylitol. Does Xylitol behave the same as Erythritol in recipes?
Thanks,
Deborah
Katrin Nรผrnberger
Hi Deborah, xylitol sets slightly softer than erythritol, so you won't get the same crunch in cookies. For cakes, it won't make any difference. If you are interested, I have recorded my personal views about the study in this facebook post.
Katrin Nรผrnberger
It is 2.6g net carbs per slice. If you would like to try a chocolate cake that contains very little fat, I recommend my pumpkin brownies.
Christine Parsons
Used half ingredients and that nearly filled my 20cms springform cake tin. Baked cake in Ninja food. First 10 minutes at 170 degrees, then read comments and turned it down to 155 degrees for further 17 minutes.
Entered the ifull amount ngredients, 12 servings, on Fitness Pal and they quote 17% carbs (19g) 76% fat 7% protein.
Out of oven, cooled, cake is crrumbly, moist but oily ( I used Montezuma and Lindt 90% cocoa chocolate). Before cooking the batter was too sweet for my liking, but once cooked, it was bitter.
What have I done wrong!
Katrin Nรผrnberger
First of all, it sounds like the cake was overbaked at a temperature that was too high. This caused the oil separation. The baking time in air fryer type gadgets is always MUCH quicker. Secondly, the bitter taste is due to the overbaking and the type of sweetener you used. Perhaps it was not a 1:1 sugar substitute? Please check your pack. The bottom line is that if you don't follow the instructions and change not one, but several things about the recipe, I cannot guarantee that it turns out perfectly. I hope this helps!
Andrea
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!
Katrin Nรผrnberger
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.
Andrea
I will definitely try it! First the olive oil cake is on my schedule ๐ Thanks a lot.
Eve
I donโt have any chocolate but bakers chocolate or an over abundance of Lillys chocolate chips. Can I use Lillys chocolate chips for the chocolate? I canโt afford to shop right now as Iโm not working. Thank you
Katrin Nรผrnberger
Yes, you can use Lily's chocolate for the cake. Be sure to adjust the sweetener and use les as this chocolate is already sweetened.
Belenda
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!
Patri
Hi dear, thanks for sharingโฆ 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 canโt wait to try it :)!
Katrin Nรผrnberger
Yes, absolutely, the yolks are not essential for the recipe.
Katrin Nรผrnberger
150 Celsius or 300F.
Victoria Holland
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.
Yoyi Tejera
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?
Katrin Nรผrnberger
I used chocolate, not cacao powder. I explain it all in the post ๐
Gena
Hey, this is the best chocolate cake Iโve 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 โค๏ธโค๏ธโค๏ธ
Victoria Holland
Hits the spot for a sumptuous chocolate experience without the piling on of calories. Enjoy!