Chocolate Mayonnaise Cake #keto #easy #microwave #chocolate #mugcake

Keto Mayonnaise Cake is a sugar-free, flour-free and low carb dessert for two! Made in the microwave, it super quick and easy. Once cooled and frosted with a whipped cream topping you are ready to serve your loved ones with a perfect after-dinner keto dessert!

Keto Mayonnaise Cake on a red plate with whipped topping

Welcome to Keto Fridays! Every Friday my team and I will be sharing with you a series of recipes that will fit the Keto Lifestyle. Our first series of recipes will be dessert for two. I felt it only appropriate to start this series off with my favorite recipe from my childhood and make a keto mayonnaise cake.

ingredients for microwave mug cake

Adapting my family recipes into the low carb keto diet plan

My goal when going Keto was to take some of my much-loved family recipes and make them keto-friendly so I could continue to enjoy them. Baking usually comes quite naturally to me. Baking Keto, however, has been more difficult. I am one to accept challenges and learn, this Keto Mayonnaise Cake cake being proof of that!

cake batter in mixing cup

Chocolate Mayonnaise Cake was always my request for my birthday and I wanted my Nanny to make it. I remember her asking me what I wanted for a birthday cake. The answer was always the same!

Microwave Cake in a mug

What you need to make this keto mug cake

Almond Flour: super fine almond flour is best.

Coconut Flour: I use this brand.

Powdered Sweetener: Since I first made this recipe, I have changed the sweetener I used. This brand is my favorite brand and the only one I use now.

Microwaveable Mug: The mug I used in the photos here is one that came in a gift pack. I also have these large soup mugs that I have used to make microwave cakes in.

Keto Mayonnaise Cake cooling on aa rack

My attempts converting to a low carb keto mug cake landed in the microwave

I made this recipe several times last year in an attempt to find a way to bake it in the oven as a mini cake. Failure was frustrating me so I gave up for a few months. Then, the last time I made it, I had extra batter so I put it in the microwave.

The texture was perfect and it had great chocolate flavor! Hence, this Microwave Keto Mayonnaise Cake was born! This keto mug cake is perfect to serve your loved one as a romantic ending to your Valentine meal or any special occasion.


Chocolate Mayonnaise Cake #keto #easy #microwave #chocolate #mugcake

Tips for the best tasting Keto Mayonnaise Cake made in the Microwave

  • I prefer this sugar-free powdered sweetener. The powdered version lends to a smoother texture.
  • To keep the cake from overcooking, start at the shortest microwave time (2 min). Microwave in 10-second intervals if the cake is still wet on top until it is no longer wet.
  • Let the cake cool at least 5 minutes before removing from the mug and cool completely before adding the topping.
  • Slice the cake in half and add filling between the layers. This adds flavor, fat, and moisture!
Keto Mayonnaise Cake with Peanut Butter Frosting
Keto Mayonnaise Cake with Keto Peanut Butter Frosting

Make this recipe your own

There are so many delicious ways to doctor up this Keto Mayonnaise Cake. Below are a few of my favorite ways!

Chocolate Mayonnaise Cake #keto #easy #microwave #chocolate #mugcake

Check out these links to some of our favorite Keto Dessert recipes!

These Chocolate Raspberry Truffles are so delicious. It is literally hard to discern these as sugar-free! It is one of my favorite molded keto chocolate recipes.

The warm chocolate lava that oozes from this Chocolate Pudding Cake is so delicious. You won’t miss the sugar-filled version!

II made this recipe because my son is a Creme Brulee and a blueberry fan (just like his momma!). This Keto Blueberry Creme Brulee is rich, creamy, and oh so delicious. It makes a great holiday occasion recipe or just because!

Keto Canolli Cake is a recipe I created due to my son’s love of Canolli! I love making my kids happy and being able to eat dessert with them is so satisfying.

Chocolate Peanut Butter Cheesecake is Keto ice cream cake heaven. This is Grumpy’s favorite cake of all. He is a huge ice cream fan and he would have eaten the whole thing if I didn’t make him share.

Next to this Keto Mayonnaise Cake, this Keto Tiramisu is one of my favorites. I love Tiramisu and now that I have this keto version, I am a happy camper.

Check out this round-up of Keto Valentine Recipes for more keto dessert ideas!

Chocolate Mayonnaise Cake #keto #easy #microwave #chocolate #mugcake

Keto Mayonnaise Cake

Keto Mayonnaise Cake is a chocolate, sugar-free, grain-free, low carb dessert for two! Ready in just 5 minutes for a quick and easy dessert.
4.53 from 19 votes
Print Pin Rate
Course: Desserts
Cuisine: American
Keyword: cake, chocolate, Chocolate Mayonnaise Cake, Keto, keto recipe, Mayonnaise, Microwave, Mug Cake
Prep Time: 5 minutes
Cook Time: 3 minutes
Cooling Time: 10 minutes
Total Time: 18 minutes
Servings: 2 servings
Calories: 344kcal


  • 3 tablespoons Powdered Sweetener
  • 4 tablespoons Super Fine Almond Flour
  • 1-½ tablespoons Coconut Flour
  • 2 tablespoons Dark Cocoa powder
  • 1 teaspoon Aluminum-free Baking Powder
  • ¼ cup Mayonnaise
  • 1 large Egg
  • 2 tablespoons Water
  • ½ teaspoon Vanilla Extract


  • Place dry ingredients in a 4-cup glass mixing bowl (swerve through baking powder). Stir to combine.
  • Add remaining ingredients and stir until batter is smooth.
  • Divide batter between 2 – 4.oz ramekins.
  • Place in microwave and cook on high power for 2 minutes. If cake is still wet on top, microwave in 10 second intervals until no longer wet.
  • Cool and serve with real whipped cream.


Calories: 344kcal | Carbohydrates: 16g | Protein: 8g | Fat: 32g | Saturated Fat: 6g | Cholesterol: 104mg | Sodium: 458mg | Fiber: 6g

About the Author: Shelby Law Ruttan

Shelby is the author/owner of Grumpy's Honeybunch. Established in 2007, she shares and preserves family recipes as well as recipes for cooking light and keto. She is an experienced, self-taught home cook who loves to share recipes with others. You can see her work on websites such as Veal Made Easy, Parade, Community Table, SoFab Food, Yummly, and FoodGawker.


  1. Alli January 18, 2019 at 8:59 am - Reply

    Loooooove this cake!! So easy and I can’t believe that the mayo makes it so good.

    • Shelby January 18, 2019 at 9:12 am - Reply

      Thanks Alli! I love this cake and it is great I can now enjoy it in smaller portion size and not feel guilty! 🙂

  2. Stef January 18, 2019 at 9:25 am - Reply

    I have friends on the Keto diet and I never know what to make them for dessert. Bookmarking this for the next time they come over. It’s perfect!!

    • Shelby January 18, 2019 at 9:30 am - Reply

      It’s great to make for just those “few” who may be around for dessert without having too much left over. I think it’s great you think of your Keto friends! 🙂

  3. Steph January 18, 2019 at 10:10 am - Reply

    This looks heavenly. Can’t wait to make it!

    • Shelby January 18, 2019 at 10:35 am - Reply

      Thanks Steph, I hope you enjoy it!

  4. Billy January 18, 2019 at 10:44 am - Reply

    Wow does this cake looks super moist, I bet it’s absolutely delicious!

    • Shelby January 18, 2019 at 10:47 am - Reply

      Thanks Billy! It was so good, I may make it again this weekend and curl up with some of this cake, a fuzzy blanket, and a book! 🙂

  5. Courtney O'Dell January 18, 2019 at 11:04 am - Reply

    I cant believe how moist and perfect this cake is – such a great find!

  6. Cassidy @ Cassidys Craveable Creations January 18, 2019 at 11:08 pm - Reply

    This cake looks so easy and delicious!!! I can’t wait to try it!!

    • Shelby January 19, 2019 at 5:23 am - Reply

      Thanks Cassidy, it is so fun too 🙂

  7. Chrys January 22, 2019 at 6:46 pm - Reply

    I’m blown away with how easy and how insanely yummy this is! First, I chose to use one large ramekin. While waiting for it to cool, I whipped up some sugar free vanilla pudding with heavy cream to sandwich between the layers with a sprinkle of lankanto powdered monk fruit on top – a fabulous version of a whoopee pie. The next experiment was to simply make it and eat it warm. It reminded me of a chocolate lava cake without the lava, lol. There is really so much you can do with this recipe. How brilliant you are! Thanks for sharing this!

    • Shelby January 23, 2019 at 9:23 am - Reply

      Hi Chrys! I’m so happy you stopped by and left a comment! So glad it turned out for you!!

  8. Marsha Maxwell January 23, 2019 at 3:10 pm - Reply

    Thanks for this recipe! My husband is on a low carb/keto diet, and this recipe is perfect!

    • Shelby January 24, 2019 at 9:54 am - Reply

      Hi Marsha, your welcome and I hope your husband enjoys it!

  9. Joanie January 23, 2019 at 3:15 pm - Reply

    I absolutely love this recipe! The cake is so moist and delicious – best of all, it’s keto!!!

  10. […] Chocolate Mayonnaise Cake For Two […]

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  12. […] Chocolate Mayonnaise Cake {Paleo, Keto, Dairy Free} […]

  13. Jenn February 11, 2019 at 6:34 pm - Reply

    Have you tried without using a microwave? We don’t use one? If so, what area the conversions.

    • Shelby February 14, 2019 at 4:57 pm - Reply

      Hi Jenn, Yes, I have made this without the microwave. Just bake it at 350. Check after 10 minutes, if still wet on top, bake another 5 minutes. The top should look dry and a toothpick inserted should come out clean. Thanks for stopping by!

  14. Renee February 26, 2019 at 8:18 pm - Reply

    do you think I could sub confectioners sugar for the sugar substitute? I know it won’t be keto, but I don’t use sugar substitute.

    • Shelby February 27, 2019 at 4:47 am - Reply

      Hi Renee, if you don’t eat keto, and want to use confectioners sugar, I believe it will turn out just fine. You could probably use granulated sugar also. You would use the same amount of regular sugar as the substitute.

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  16. Calandra Arrington April 15, 2019 at 7:29 pm - Reply

    I have been living the keto lifestyle for 4 months and having been craving cake. I also wanted wantedto find a low carb recipe to make my bunny cake this Easter. I stumbled across this recipe and so glad I did. The cake was so moist and tasty. Cannot tell that it’s low carb at all. I used cream cheese frosting as oppose to whipped cream (personal preference is all). Now I have to figure out how to make a much larger cake in the oven. I will be making this again!!!

    • Shelby Law Ruttan April 15, 2019 at 8:07 pm - Reply

      Hi Calandra, I’m so glad you enjoyed the recipe! Thank you for stopping by to share!

  17. Dave R May 11, 2019 at 8:51 pm - Reply

    I was looking for a microwavable cake that my wife could make for a Tupperware Party. I saw this and thought, “Chocolate Mayonaise Cake?!?! WTH??” … but I LOVE trying new foods, and things that sound like an oddity (like chocolate covered bacon).

    I made this mug version to test out and OH MY FREAKIN’ GOSH IS THIS DELICIOUS!!

    Thank you for this amazing recipe that I will make again I’m sure.

    • Shelby Law Ruttan May 12, 2019 at 7:53 am - Reply

      Hi Dave, thank you SO MUCH for leaving your comment to let me know how the recipe turned out for you. I am so happy you loved the recipe!

  18. Vanessa June 4, 2019 at 4:58 pm - Reply

    Can I just use all almond flour? Will I need to tweak any measurements in that case?

    • Shelby Law Ruttan June 8, 2019 at 8:23 am - Reply

      Hi Vanessa, the coconut flour does thicken it some. You could try it though. I can’t guarantee how it would turn out. Next time I make it however, I will test it to see.

  19. […] When this happens, I like to have quick and easy dessert recipe. Some of my go to recipes are Chocolate Mayonnaise Cake. This recipe is made in a mug in the microwave and is freakin fabulous! I also love these Chocolate […]

  20. Anonymous October 4, 2019 at 8:59 am - Reply


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  23. […] Full recipe here […]

  24. […] made this Keto Chocolate Mayonnaise Cake for two because of my love of the cake. I would request a mayonnaise cake every year for my […]

  25. […] Chocolate Mayonnaise Cake recipe for two […]

  26. […] Keto Mayonnaise Cake is a delicious recipe for two made right in the […]

  27. […] 4 ingredients. It is thick and creamy and full of peanut butter flavor. Perfect for frosting this Keto Mayonnaise Cake, or a loaf of your favorite Keto Banana […]

  28. […] Keto Mayonnaise Cake is my low carb take on my childhood favorite Chocolate Mayonaisse Cake (which is not keto). […]

  29. Mandy February 4, 2021 at 3:34 pm - Reply

    I would love to make this as a cake to serve my family for my dad’s birthday this weekend! Do you have an adaptable version for either a 8×8 or 9×11 cake? Thanks 🙂

    • Shelby Law Ruttan March 30, 2021 at 8:41 am - Reply

      Hi Mandy, I am so sorry I didn’t see this sooner! I do not have a larger version cake but will definitely be working on one! Thank you! Shelby

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Shelby Welcome! I'm Shelby, author of Grumpy's Honeybunch. I have been sharing family favorite recipes since 2007. I started the Keto Diet in October 2017 and since then I have been creating Keto ... read more

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