Keto Lemon Mug Cake

This keto lemon mug cake is a 5 minute dessert just for one! Enjoy when you want a delicious cake without leftovers tempting you every day. You’ll love the perfect mix of a tart and sweet flavors.

Keto lemon mug cake in a white mug topped with whipped cream.

Keto Lemon Mug Cake

Need a sweet treat that is perfect for one serving? Both Alan and I crave sweets, so I’m always looking for ways to keep it under control.

One way to keep dessert snacking at bay is to enjoy small servings by eating what you bake right away. That way we don’t snack endlessly.

If you have tried my low carb carrot mug cake, then you already know that mug cakes are the way to go when you want a quick treat!

Plus, keto mug cakes are actually really filling. I’m certain you will be completely satisfied with this keto lemon mug cake.

A forkful of keto lemon mug cake right out of the white mug.

What is a mug cake?

A mug cake is a quick and easy single serving of dessert.

It’s called a mug cake because you can mix it and cook it in the microwave right in the cup!

Like I mentioned, mug cakes are a great way to control serving proportions, especially when you are living the Keto lifestyle.

How To Make Keto Lemon Mug Cake

This cake is cooked in a microwave and will be ready to enjoy in just a couple of minitues.

Gather the following ingredients:

  • Almond flour
  • Coconut flour
  • Baking powder
  • Swerve or your favorite sweetener
  • Butter or coconut oil
  • Egg
  • Vanilla extract
  • Lemon
Overhead view of all the ingredients to make keto lemon mug cake

You will need the following kitchen tools:

  • Microwave
  • 8 ounce mug (microwaveable)
  • Measuring cups and spoons

To Make Keto Lemon Mug Cake

The mixing bowl in a mug cake is the the same bowl used in the microwave.

First, whisk together the flours, sweetener, and baking powder.

Second, add the egg, vanilla extract and lemon juice. Once all the ingredients are combined, fold in lemon zest.

Finally, place in the microwave and cook for about 2 minutes.

Now add a dollop of whipped cream or a sprinkle of confectioner’s Swerve.


I think the proportions and combination of almond and coconut flour are perfect for this recipe, but this mug cake can be easily adjusted if needed.

You can make it allergen friendly, by switching out flours and adjusting liquid levels with more or less lemon juice.

Just remember that coconut flour requires more liquid than some other flours.

You can also change the flavor completely by using orange instead of lemon or adding other fresh fruits to the cup before cooking.

Overhead view of keto lemon mug cakes topped with whipped cream and a sprinkle of lemon zest.

Can I Use Lemon Extract?

Yes, if you don’t have fresh lemon juice, the you can replace 1/2 teaspoon of extract for the tablespoon of fresh lemon juice.

How do I know when it is done?

When the keto mug cake is done, the top will no longer be shiny and will not stick to your finger when lightly pressed.

You can always test your mug cake for doneness by inserting a toothpick in the center.

If the toothpick comes out clean, the mug cake is done.

Close up view of keto lemon mug cake in a white mug topped with fresh whipped cream.

Can I Cook This In The Oven?

This treat is meant to be quick and easy, but I realize some people do not like to cook food in a microwave.

As long as your mug is oven proof, then this can be baked at 350°F for 12-15 minutes. Test for doneness the same as explained above.

Alternatively, an 8 ounce oven proof ramekin dish or small baking dish can be used in place of the mug.

Craving More Lemon Keto Desserts?

If you love the bright citrus flavor from lemon, then you will also want to try these low carb lemon bars.

Lucious lemon bars for low carb and keto diet followers! #glutenfree #lemonbars #dessert #ketorecipe #lowcarbdiet #thefoodieaffair

And sugar free lemon curd.

Sugar Free Lemon Curd! Add this lower carb smooth and silky dessert to your favorite treats! #lowsugar #curd #lemon #dessert |
A forkful of keto lemon mug cake right out of the white mug.

Keto Lemon Mug Cake

This keto lemon mug cake has the nice tang from the fresh lemon juice and just enough sweetness to enjoy this personalize cake for dessert. Top with whipped cream or a sprinkle of powdered Swerve.
5 from 4 votes
Print Pin Rate
Course: Dessert
Cuisine: American
Keyword: almond flour, cake, coconut flour, dessert, keto, lemon, low carb, mug cake, sweet
Prep Time: 3 minutes
Cook Time: 2 minutes
Total Time: 5 minutes
Servings: 1 Serving
Calories: 461kcal
Author: Sandra Sandra


  • 3 Tablespoons almond flour
  • 1 Tablespoon coconut flour
  • 1 ⁄2 teaspoon baking powder
  • 2 Tablespoons granular swerve
  • 1/4 teaspoon vanilla
  • 1 Tablespoon lemon juice
  • 1 egg
  • 1 Tablespoon butter or coconut oil melted
  • 1 ⁄2 teaspoon lemon zest divided


  • In a microwave safe mug (8 ounce), mix together the almond flour, coconut flour, baking powder and Swerve.
  • Add the egg, butter, vanilla, lemon juice and half of the lemon zest. Mix until throughly combined.
  • Sprinkle the remaining lemon zest on top.
  • Cook the mug cake for 1 1/2-2 minutes or until the top is set and fully cooked.
  • Sprinkle with powdered Swerve or whipped cream (optional).


Serving: 1g | Calories: 461kcal | Carbohydrates: 11g | Protein: 13g | Fat: 42g | Saturated Fat: 22g | Polyunsaturated Fat: 17g | Cholesterol: 217mg | Sodium: 415mg | Fiber: 4g | Sugar: 3g


Please note that the nutritional information provided are guidelines and may vary based on the brand of products used. For your specific nutritional goals use My Fitness Pal or Verywell Fit recipe calculators. All content within this site is not intended as medical diagnosis or treatment and should not be considered a substitute for professional medical expertise.


Keto lemon mug cake in a white mug. This sweet and tart personalized cake will hit the sweet tooth spot! #lowcarb #lemon #cake
Hugs Sandra Signature

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *

Recipe Rating

This site uses Akismet to reduce spam. Learn how your comment data is processed.


  1. I’ve taken the recipe and put contents into 2 ramikins that way the nutrition for each serving is 2 carbs only rather than 4 for the full dessert. A wonderful dessert very refreshing ty Never have I seen or had mug lemon ty again

  2. Hubby and I are doing keto with intermittent fasting. Coming across your recipe, I could not believe my eyes,! I LOVE all things lemony, especially lemony desserts and haven’t had one for so long! Your fab lemon mug cake saved the day. We are having two of those amazing keto mug cakes tonight as a treat after dinner. Can’t wait. Thank you!

  3. Fabulous! I absolutely love keto mug cakes. They take hardly any time at all to make, perfect for those nights you need something right now! Lemon is one of my favourite dessert flavours so this lemon mug cake is a major winner in my books!

  4. I really loved your post. I read your blog quite often and I just shared
    it on Pinterest. Keep up the good work.

  5. I have a few friends who are doing the keto diet. Lately they’ve been asking me for desserts, so I’m going to pass this one on to them. I love anything with lemon, so this mug cake is something I’d enjoy as well.

  6. Mug cakes are a staple in my home. They give an easy dessert option and are quick to prepare. I am always on a lookout for new recipes. Lemon cake is my favourite and this looks so yummy. Am trying this for sure.

  7. oh cool! I’ve seen lots of recipes for chocolate mug cake but never one for lemon mug cake…that’s more my flavour preference sometimes. Love the bright and citrus-y flavours.

  8. This was the perfect sweet treat! It totally satisfied my sweet tooth, and I love that it’s low in carbs — you’d have no idea.