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This keto lemon mug cake is the most delicious almond flour mug cake to snack on keto diet. An easy 5 ingredients mug cake  with tangy lemon flavor and only 7 g net carbs.

Keto Lemon Mug Cake

You know how much I love lemon keto recipes, especially lemon cakes. I recently shared with you my keto lemon pound cake recipe and you requested a smaller size recipe. Say hello to my keto lemon mug cake ! 

Keto lemon mug cake – an almond flour mug cake

This keto lemon mug cake is the most easy recipe to share with your loved one and made with only 5 ingredients. Let see what you need to create this simple moist, spongy lemon cake.

  • Almond flour is an amazing keto flour that crate moist, spongy cakes. If you have nut allergy you can replace almond flour by sunflower seed flour
  • Egg – this recipe can’t be made egg free I am sorry
  • Baking powder  or half amount of baking soda
  • Lemon juice – I used fresh lemon juice
  • Sugar free crystal sweetener – I love Monk fruit crystal or erythritol but feel free to use xylitol, all with the same ratio
  • Lemon zest – this is optional of course but flavorsome and won’t dd carbs. I grated some zest from my homegrown lemon. Make sure you use untreated lemon before adding zest to your recipe.

How to cook mug cakes?

Mug cakes are usually baked 90 seconds in the microwave. You must use the high powder (800W) of your microwave for perfect baking results. If you don’t have a microwave, mug cakes can be baked in a small ramekin in the oven. Preheat oven to 180 C (350F) and bake our mug cake for 12-15 minutes. You know it is cooked when a pick inserted in the center of the mug cake comes out clean or with few to no crumbs on it.

Keto Lemon Mug Cake

Keto lemon cake serving ideas

Keto lemon mug cake is delicious on its own or top up with unsweetened coconut yogurt. Coconut yogurt is made of only 2 ingredients : coconut cream and probiotic. It is a delicious dairy free keto yogurt and I love the combo of lemon and coconut. Otherwise, use unsweetened whipped cream or Greek yogurt.

Keto Lemon Mug Cake

How to decrease the carbs per serving?

If you believe that 7.4 grams of net carbs is too much for you, share with a friend ! Simply cook the recipe all at once and half the mug cake to share.

More keto mug cakes

If you love easy keto mug cakes as I do, you may want to try the others mug cake recipe below

Don’t forget to leave me a comment below if you made this recipe and save it on Pinterest for later !

XOXO Carine
Keto Lemon Mug Cake

Keto Lemon Mug Cake

Keto Lemon Mug Cake easy 5 ingredients lemon mug cake with a delicious moist sponge texture
Prep Time: 3 mins
Cook Time: 2 mins
1 serve
Leave A Review Print The Recipe



  • 1 teaspoon grated lemon zest - use organic untreated lemon
  • 2 tablespoon blueberries -fresh or frozen

Serving ideas


  • In a small mixing bowl, whisk together egg, almond flour, baking powder, sugar free crystal sweetener and lemon juice to form a consistent cake batter.
  • Add in some optional ingredients now, if desired, like lemon zest or blueberries - fresh or frozen.
  • Transfer the batter into a high microwave safe mug. Your mug cake is going to raise and double in height so make sure the mug you use is high enough to avoid the mug cake batter to overflow in the microwave. Don't microwave into 2 mugs or it will impact the microwaving time consequently. Bake all at once and share!
  • Microwave on high power (800W) for 90 seconds.
  • Remove from the microwave and cool for 2 minutes before eating and adding any toppings.
  • Enjoy directly into the mug or un mold on a plate and half the recipe to share !

Baking method

  • Preheat oven to 180C (350F)
  • Place the batter into a medium size oven ramekin or 2 small ramekins.
  • Bake for 12-15 minutes. Make sure you check the baking process after 8 minutes and every 2 minutes. Use a skewer that you insert in the center of the mug cake. It is baked when it comes out with no (or very little) crumb on it. Note that if you are using smaller ramekins and half the batter in two ramekins the cakes cook faster between 8-12 minutes.


  • Microwave baked cakes don't store well, no more than 30 minutes to 1 hour. After that, the texture dry out really fast and you will lose the spongy cake texture. I recommend you bake the mug cake if you intend to store those for 2-3 days at room temperature.
Serving size
This recipe serve 1 mug cake that you can split in two to decrease the amount of net carbs per servings to only 3.7g. 
Nutrition panel 
Nutrition panel is for one mug cake batter without the blueberries. It includes 7.4 g net carb per serve. If you add 2 tablespoon of blueberry you up the carbs slightly to  9.8 g net carb per serve and 252 calories.
Nutrition Facts
Keto Lemon Mug Cake
Amount Per Serving (1 g)
Calories 240 Calories from Fat 89
% Daily Value*
Fat 9.9g15%
Carbohydrates 8.6g3%
Fiber 1.2g5%
Sugar 1g1%
Protein 10.4g21%
* Percent Daily Values are based on a 2000 calorie diet.

Keto Lemon Mug Cake

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  1. 5 stars
    One of my favorite go to keto desserts. Thanks for sharing. It’s so easy to make and like you said, share with a friend. It’s a perfect portion

    • Yeah! I am so happy for you and thanks so much for taking a minute to report back, Enjoy the recipes on the blog, XOXO Carine.

  2. 5 stars
    I am staying in a resort with a tiny kitchen, so yesterday I made this in the microwave (yes, I brought all my food stuffs). It was AMAZING. I made it again today with wild raspberries we found on our hike. Question—could I quadruple it and make it in the oven? If so at what temp and for how long?

    • I am pretty sure this will work well in the oven too. If you quadruple the recipe you will have to bake for at least 25-35 minutes in a round cake tin, greased at 180C (350F). Let me know how it goes and enjoy your holiday! XOXO Carine.

    • Probably. Coconut flour has 4 times more fiber than almond flour so if you really want to use 100 % coconut flour you will have to adjust the recipe a lot and probably use way less. I didn’t try so I can’t help with that sorry . Enjoy the blog recipes, XOXO Carine.