Keto Lemon Mug Cake

With a burst of fresh lemon flavor, this easy peasy keto Lemon Mug Cake is the perfect dessert! Not too sweet and totally keto, yes, you can indulge in a treat and this one is ready in a jiffy!

Keto lemon mug cake in a clear glass mug with a spoon to the side.
  • Green circle with a green keto-recipe symbol
  • Green circle with a green vegetarian-recipe symbol
  • Green circle with a green nut-free-recipe symbol
  • Green circle with a green dairy-free-recipe symbol
  • Green circle with a green paleo-recipe symbol
  • Green circle with a green low-carb-recipe symbol

Got 5 minutes? That’s about how long it takes to make this easy and tasty low carb lemon mug cake. It’s light, fluffy, and full of lemon flavor!

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Enjoying desserts in a keto lifestyle can be a challenge. I either end up with tons of leftovers, or I spend too much on packaged goods only to find out that they’re not really keto at all (always read the nutrition label)!. That’s why I love mug cakes.

I’m the only one in my family doing keto and so I need desserts just for me; a mug cake is just the thing! Made with common ingredients and ready in under 5 minutes, I can have a hot and tasty treat in no time!

A horizontal shot of a keto lemon mug cake in a glass mug with a spoon to the side.

Ingredients

  • Almond flour – Use super-fine grind if you can find it.
  • Coconut flour
  • Baking powder
  • Butter – I use salted butter. Add a pinch of salt if you use unsalted butter.
  • Egg – Just 1
  • Brown sugar substitute – Use your favorite brand.
  • Lemon juice – Freshly squeezed.
  • Lemon zest
Labeled ingredients to make keto lemon mug cake.

How To Make The Best Keto Lemon Mug Cake

  1. Mix the dry ingredients in a small bowl.
  2. Mix the melted butter, egg, lemon juice, and lemon zest in another small bowl.
  3. Mix the wet and dry ingredients together.
  4. Butter the insides of a large mug.
  5. Add the batter to the mug and microwave it on high for about 90 seconds.
  6. Check if your mug cake is done, then dig in!

Chef Jenn’s Tips

  • Start with a mug that’s much larger than the volume of cake batter. The cake will double in size as it cooks, and you don’t want it spilling over the top of the mug.
  • Don’t overmix the ingredients! It’s fine if there are a few small lumps.
  • Garnish your keto Lemon Mug Cake with whipped cream and a bit of lemon zest.
  • Insert a toothpick or thin knife into the center of your mug cake to see if it is cooked. There should be a few clingy crumbs but no raw batter. If you see batter, give it another 10-15 seconds to cook.

Recommended

Storage

Pop any leftover keto Lemon Mug Cake into an airtight container and keep it in the fridge for 2-3 days. Warm it gently in the microwave to heat it up.

Step By Step Process

Keto lemon mug cake in a clear glass mug with a spoon to the side.
Print Pin
5 from 5 votes

Keto Lemon Mug Cake

Rich, moist, and lemony, this easy-peasy keto Lemon Mug Cake is a terrific dessert that's designed for one! Low in net carbs and ready in under 5 minutes, indulge today!
Course Desserts
Cuisine American
Keyword cake, lemon, lemon cake, lemon mug cake, mug cake
Prep Time 2 minutes
Cook Time 1 minute
Total Time 5 minutes
Servings 1
Calories 250kcal
Author Chef Jenn

Ingredients

  • 2 tablespoons almond flour
  • 1 tablepsoon coconut flour
  • 1/2 teaspoon baking powder
  • 1 tablespoon salted butter
  • 1 egg
  • 2 teaspoons brown sugar substitute
  • 1 teaspoon lemon juice
  • 1 teaspoon lemon zest

Instructions

  • Mix the dry ingredients in a small bowl.
  • Mix the melted butter, egg, lemon juice, and lemon zest in another small bowl.
  • Mix the wet and dry ingredients together.
  • Butter the insides of a large mug.
  • Add the batter to the mug and microwave it on high for about 90 seconds.
  • Check if your mug cake is done, then dig in!

Notes

Chef Jenn’s Tips

  • Start with a mug that’s much larger than the volume of cake batter. The cake will double in size as it cooks, and you don’t want it spilling over the top of the mug.
  • Don’t overmix the ingredients! It’s fine if there are a few small lumps.
  • Garnish your keto Lemon Mug Cake with whipped cream and a bit of lemon zest.
  • Insert a toothpick or thin knife into the center of your mug cake to see if it is cooked. There should be a few clingy crumbs but no raw batter. If you see batter, give it another 10-15 seconds to cook.
**please note that the sugar alcohols from the sugar substitute are not calculated in this recipe because they have no calories and no carbs.

Nutrition

Serving: 1cake | Calories: 250kcal | Carbohydrates: 5g | Protein: 9g | Fat: 23g | Saturated Fat: 9g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Trans Fat: 0.5g | Cholesterol: 194mg | Sodium: 367mg | Potassium: 73mg | Fiber: 2g | Sugar: 1g | Vitamin A: 589IU | Vitamin C: 5mg | Calcium: 178mg | Iron: 2mg | Net Carbohydrates: 3g

A Note on Nutritional Information

Nutritional information for this recipe is provided as a courtesy and is calculated based on available online ingredient information. It is only an approximate value. The accuracy of the nutritional information for any recipe on this site cannot be guaranteed. Erythritol carbs (sugar substitutes) are not included in the carbohydrate counts as they have been shown not to impact blood sugar, and they have zero calories and zero carbs. Net carbs are the total carbs minus fiber.

WANT EVEN MORE EASY KETO DIET RECIPES?

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5 thoughts on “Keto Lemon Mug Cake”

  1. 5 stars
    It came out so delicious and inviting. This is the perfect dessert if I want something quick and yummy. It took me 3 minutes. Literally. So good! Recommended!

    Reply
  2. 5 stars
    I have been missing cake ever since I changed my diet. So, I was so happy to come upon your recipe, Jenn. I made your recipe and now, it’s permanently bookmarked. The recipe turned out so delicious.

    Reply
  3. 5 stars
    I made this keto mug cake for my nephew suffering from diabetes Mellitus. I was searching for something healthy and easy to make. He just loved it and decided to make it by himself.

    Reply
  4. 5 stars
    I am obsessed with mug cake at the moment but this lemon version was so refreshing I don’t think I can go back to chocolate!

    Reply
  5. 5 stars
    Mug cakes are my new favorite keto treat. This lemon version is so delicious and I love that it makes only one serving so I’m not overeating.

    Reply

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