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
Yield: 2 servings

Keto Mayonnaise Cake

Prep Time: 5 minutes
Cook Time: 3 minutes
Cooling Time: 10 minutes
Total Time: 18 minutes

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.


  • 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


  1. Place dry ingredients in a 4-cup glass mixing bowl (swerve through baking powder). Stir to combine.
  2. Add remaining ingredients and stir until batter is smooth.
  3. Divide batter between 2 - 4.oz ramekins.
  4. 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.
  5. Cool and serve with real whipped cream.

Nutrition Information



Amount Per Serving Calories 344Total Fat 32gSaturated Fat 6gCholesterol 104mgSodium 458mgCarbohydrates 16gNet Carbohydrates 4gFiber 6gSugar Alcohols 6gProtein 8g

Nutrition information calculated using myfitnesspal is provided as a courtesy, but will vary depending on the specific brands of ingredients you use. Please consult with your doctor regarding specific health needs.

Did you make this recipe?

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