This Giant Donut Cake may be the pinnacle of my keto baking career! So fun and pretty, it makes a great cake for birthday parties. Low carb and sugar-free.
Keto Chocolate Donut Cake on a white cake stand

This Giant Donut Cake may be the pinnacle of my keto baking career! So fun and pretty, it makes a great cake for birthday parties. Low carb and sugar-free. This post is sponsored by Bob’s Red Mill.

Keto chocolate bundt cake made to look like a chocolate donut with pink frosting

I cannot lie to you, my faithful readers. This keto donut cake isn’t exactly the easiest dessert I’ve ever made. But it’s not exactly hard either. It has multiple steps to it and it takes time and effort, but nothing requires any special techniques. It’s really fun to make, and oh my word, is it spectacular!

If you are up for a bit of a keto baking challenge and you want to knock the socks off those keto naysayers, or you have a kid who is just dying for an impressive birthday cake, then this is the keto cake recipe for you. It really does look like a giant donut.

Don’t worry, I am going to walk you through every step. With photos!

I made this for my daughter’s 12th birthday party in December. I had seen a giant donut cake recipe on Pinterest and I saved it, thinking it would be a fun one to ketofy. When I showed it to my daughter, her eyes lit up and she agreed I could experiment for her birthday.

 

Keto Chocolate Donut Cake on a white cake stand

The conventional version was a white cake with a pink filling, but my darling girl wanted chocolate for the cake part. And she’s not much into pink these days but she let me do the pink frosting because it’s such a pretty contrast with the chocolate brown.

I had to think for a while on how to do this. I searched for the right kind of baking pan and I even ordered one that was specifically for donut cakes…except I knew the minute I saw it that it was much too small.

As I don’t want my readers to have to purchase specialized pans, I opted for my regular bundt pan. It does have some ridges but I knew I could cover those with a little chocolate frosting. Turned out perfectly!

Okay, ready for a full cake tutorial here? I tried to take photos along the way so you can see exactly how it’s done.

A slice of giant donut cake with pink filling

How to Make a Giant Donut Cake

The cake is just a regular chocolate bundt cake. To get really good consistency and texture, I recommend using a combination of Bob’s Red Mill almond flour and coconut flour. Together, they make a low carb cake with a fine crumb. Since I wanted the cake to hold together really well, I also used some Bob’s Red Mill xanthan gum.

The hardest part for a donut cake like this is the filling. But really, while it is multiple steps, it’s not difficult – it simply takes time. So I am going to go through these steps as carefully and as clearly as possible.

Once the cake is cool, you need to flip it upside down. The best way to do this is to cover the top with a cookie sheet and then get one hand underneath the bottom rack or plate and one hand firmly on the top plate. Then flip the whole thing upside down.

Trench in the bottom of the donut cake

You need to create a trench for the low carb raspberry frosting, but you also need to save pieces of the trench to cover the filling. So you can’t just start digging into it. Take a sharp knife and cut into the cake at an angle all the way around the outside edge. Then do the same on the inside edge so you are taking out triangular shaped pieces. You only need to cut in by about an inch.

Cut it out by sections. Save these pieces because you will be using slicing off the very bottom to put back onto the cake once it’s filled.

Pink raspberry filling in a chocolate bundt cake

Now take a spoon to dig out a nice trench about an inch and a half to 2 inches deep. Spoon in the filling, leaving a little space at the top so you can put more cake back in. You won’t use all of the raspberry frosting so set the remainder aside for the top of the cake.

Take each section of cake you cut out and slice off the very bottom and put it back over the filling.

Cake covering the raspberry filling

None of this needs to be perfect. As long as the filling is covered with cake so that it doesn’t goo out once you flip it back over, you’re good. No one will be able to tell once that pretty cake is cut into slices.

Frosting a Keto Donut Cake

Because my cake was done in a bundt pan and wasn’t perfectly smooth, I decided to cover the whole thing in a layer of low carb chocolate buttercream. You don’t have to do this – I’ve seen other donut cakes with the bundt pan ridges showing. But it does add to the chocolate-y goodness!

Keto chocolate frosting on a keto bundt cake

For the final glaze, you use the remainder of the raspberry frosting and thin it out with water. It’s hard to say exactly how much water to use, but you want it to be pourable but still quite thick. So add one tablespoon of water at a time, whisking it in, until you have the right consistency.

Then spoon it over the top of the cake, pushing it over the sides with a spatula so it makes nice swoops and drizzles. Add a few colourful sprinkles, if desired.

Spooning sugar free raspberry frosting over a keto donut cake.

And refrigerate that sucker for at least 2 hours!

Phew! Wasn’t that fun? Definitely some work but fun nonetheless. And now you’ve got a great keto donut cake with delicious chocolate frosting and raspberry filling.

Let’s get baking!

Giant Keto Donut Cake

More Keto Birthday Cake Ideas!

Ding Dong Cake

Keto Italian Cream Cake

Mini Chocolate Cake with Whipped Ganache Frosting

Keto Yellow Cake For Two

Chocolate Blackout Cupcakes

Keto Chocolate Donut Cake on a white cake stand
5 from 5 votes

Giant Donut Cake - Low Carb and Keto

Servings: 16 servings
Prep Time 1 hour
Cook Time 45 minutes
Total Time 1 hour 45 minutes
This Giant Donut Cake may be the pinnacle of my keto baking career! So fun and pretty, it makes a great cake for birthday parties. Low carb and sugar-free.

Ingredients
 

Cake:

Raspberry Frosting:

Chocolate Frosting:

Instructions

Cake:

  • Preheat oven to 325F and grease a large bundt pan (9 to 10 inches in diameter) well. I like to double grease (working butter into the pan first and then spraying with coconut oil or avocado oil spray).
  • In a large bowl, whisk together almond flour, sweetener cocoa powder, coconut flour, whey protein, baking powder, salt, and xanthan gum
  • Add the eggs, melted butter, vanilla extract and 2/3 cup of the water. Add the If your batter is very thick add additional water, 1 tbsp at a time, until it thins out. It should be spreadable but not pourable.
  • Spread batter in the prepared pan and smooth the top. Bake 45 minutes or until set and a tester inserted in the center comes out clean.
  • Let cool in the pan 30 minutes, and then flip out onto a wire rack to cool completely.

Raspberry Filling/Frosting:

  • In a small saucepan over medium heat, bring the raspberries and water to a boil. Cook about 5 minutes, until the berries can easily be mashed. Strain through a sieve into a bowl, pressing on the solids to extract as much juice as possible. 
  • In a large bowl, beat the cream cheese, butter, and sweetener together until smooth. Beat in the raspberry juice and the extracts. If the frosting is stiff, beat in the heavy cream. DO NOT ADD THE WATER YET!

To Fill the Cake:

  • Flip the cake over carefully onto a plate to cut a trench in the bottom. You will cut a trench about 1 1/2 inches wide in the bottom of the cake, and about 1 1/2 inches deep. Use a sharp knife to cut at an angle so that you can lift whole sections of the cake out intact (you will need pieces of it to cover the filling before flipping the cake back over).
  • Use a spoon to scoop out more of the cake so that the trench is rounded at the bottom. In the end you want the trench to be about 1 1/2 to 2 inches deep. Fill the trench with raspberry frosting, almost but not quite to the top (you will only need about a cup or so of frosting to fill the cake).
  • Cut the very tops from the pieces you cut out and use those to cover the frosting in the trench. Press down to get it firmly in there. Then cover the bottom of the cake with a serving plate and flip the whole thing back over. 

To Frost the Cake:

  • Make the chocolate buttercream as directed and all over the entire cake, even inside the hole of the bundt. 
  • Whisk water 1 tablespoon at a time into the remaining raspberry frosting, until it is thick but pourable. Spoon it over the cake and let drip thickly down the sides. Add a few fun sprinkles and refrigerate at least 2 hours. 

Notes

This is a big, filling cake. Although I've said it serves 16, it could easily serve 2o if you are serving with a bit of keto ice cream! 

Nutrition

Serving: 1serving = 1/16th of cake | Calories: 355kcal | Carbohydrates: 8.3g | Protein: 8.2g | Fat: 31.3g | Fiber: 3.8g
I’d love to know your thoughts, leave your rating below!

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5 from 5 votes

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Recipe Rating




22 Comments

  1. What if I don’t have protein powder

    1. I would get some before making this. In the absence of gluten (which is a protein), it helps baked goods rise and hold their shape. Since you are cutting into this cake to put in the filling, I wouldn’t skip it.

  2. 5 stars
    This looks so rich and decadent…can’t believe it’s low carb! Trying soon!

  3. 5 stars
    I love this fun cake! It’s fantastic for birthdays and soo, sooooo tasty.

  4. 5 stars
    This is such a show stopper! Such a fun idea.

  5. Stephanie says:

    5 stars
    Such a delicious low carb recipe that satisfied my insatiable sweet tooth!

  6. Would this freeze if cut into portions??

    1. Sure. The frosting may change consistency a bit.

  7. Stephanie Pillow says:

    Are the sprinkles sugar free? j
    Just curious.

    1. No, there really is no such thing unless you make your own, which is time consuming. But each slice gets about two so it would be all of maybe 0.0005g of carbs…

  8. cant wait bake this cake. Is there a substitute for Whey Protein? Collegan? thanks

  9. Carolyn, you have so many fun and lovely cake recipes! Makes me wish we had a cake-worthy occasion every week! This one is so pretty, and it sounds absolutely delicious. Hope it was heartily enjoyed at your daughter’s party.

  10. As I have limited time but yearn for this cake, I will bake the cake and have the filling and frosting in bowls on the side . love combination of Raspberries and chocolate ! 5 stars for efforts !

    By the way Carolyn, that green strip on left side of the webpage is always in the way . It drives me crazy as I am unable to read all the words .

    1. What green strip? I don’t have one. Can you take a screenshot for me and email it? I rather suspect it’s something with your browser but I am not sure…

  11. This makes me SO happy! Does it taste like a doughnut? Also, if you left out the cocoa powder would it be like a white cake/doughnut?

    1. I suggest you actually find one of my vanilla cakes (like the one for the caramel cake) instead of just leaving out the cocoa. If you do that, you change the consistency.

      1. Ok, thanks. This is the best looking cake ever! 🙂

  12. Louise W Fierro says:

    Have you ever addressed the higher altitude baking with Keto ingredients? I have tried numerous recipes and all have fallen short of the desired end product. They either don’t rise or fall dramitically after they cool completely! Do you have any hints for us who are in higher altitudes, over 3500 to 7000 feet? Thanks for your answer!

    1. Hi Louise. I’ve never actually baked at significant altitude so I don’t have experience with this. But I have asked around and from what I hear, you make some of the same changes that you do for regular baking.

  13. So is it 16bservings or 20 for the 355 calories? In the chart it says 16 and in the beginning comments it says 29

    1. Sorry, it’s 16! Let me fix that. I was playing with the numbers but felt that 20 was too many servings.

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