Free Printable: Six EASY Keto Mug Cake Recipes!

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    Home » Dessert Recipes » Cakes & Cupcakes » Keto Lemon Mug Cake

    Keto Lemon Mug Cake

    Gluten & Grain Free RecipesLow Carb & Keto RecipesSugar Free RecipesTrim Healthy Mama Recipes

    Published: Sep 9, 2020 by Taryn

    This post may contain affiliate links which won’t change your price but will share some commission.
    Print Recipe Jump to Recipe
    pinterest image for keto lemon mug cake

    After the first taste of this Keto Lemon Mug Cake, it will become your new go-to dessert. This mug cake recipe is light and fluffy with a vibrant lemon flavor that pairs perfectly with fresh berries and a cup of tea. This perfect single-serving sized dessert is great for all occasions and simple to make. This easy recipe is low carb, gluten-free, nut-free, grain-free, sugar-free, and Trim Healthy Mama friendly. 

    close up of keto lemon mug cake with a bite on a fork

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    You already know I have a strong affection for both mug cakes and recipes with lemon! Mug cakes are such easy recipes and lemon is one of my favorite flavors so I figured why not combine the two and create a delightful dessert that has the best of both worlds. It’s even better than I ever could have imagined and knew I wanted to share it with all of you right away. 

    All my lemon lovers are going to rejoice when they quickly and easily make a sugar free lemon mug cake and put that first forkful in your mouth. If your taste buds don’t jump for joy I will be shocked. The flavor is tangy, zesty, and refreshing. Using all coconut flour instead of almond flour makes this cake light while being moist.

    Don’t get me wrong, I always love chocolate desserts too. I can’t pass up my Keto Chocolate Cake or Chocolate Chip Cookie Cups. However, anything that is lemon-flavored, like Sugar Free Lemon Bars, steals my heart and is often my go-to dessert craving. 

    lemon cake on a plate topped with raspberries

    Keto Lemon Mug Cake Ingredients

    You only need seven ingredients to make this moist and flavorful gluten free mug cake. You probably have many of them in your kitchen right now!

    • Butter - Make sure that the butter is softened. You can set it on the counter ahead of time, so it softens or toss it in the microwave for 10 seconds or so. You don’t want it to be melted or really cold. 
    • Lemon Extract - If you don’t have some lemon extract, it’s worth getting some. It goes with so many delicious lemon desserts, just like this mug cake. If you don't have lemon extract you can sub in lemon zest. Lemon juice will not work, you need extract or zest for a vibrant lemon flavor.
    • Sour Cream - The low carb mug cake is super moist in part because of the sour cream. You only need one tablespoon for it to do its job. 
    • Egg - Don’t skip the egg; it’s what binds the ingredients together and gives the mug cake the right texture. 
    • Sweetener - You can either use the Trim Healthy Mama Gentle Sweet or use my all-natural sweetener.
    • Coconut Flour - Using coconut flour keeps the mug cake gluten-free and full of flavor too. 
    • Baking Powder - Make sure you are using good quality and non-expired baking powder. It makes the mug cake have the proper rise and keeps it fluffy.  

    ingredients in a bowl

    How To Make A Mug Cake

    As with my other mug cakes, this lemon cake is also super quick and easy to make. It’s just a few ingredients, and you will be able to indulge! Let’s get started:

    First Step: Combine softened butter, lemon extract, sour cream, egg, sweetener, coconut flour, and baking powder in a microwave-safe mug or small bowl.

    cooked mug cake in small bowl

    Second Step: Mix well, then microwave for 1 minute and 30 seconds. Eat right from the mug or bowl or invert onto a plate.

    cake inverted onto a plate

    It’s truly that easy! You are going to love this mug cake and how flavorful it is. 

    Keto Lemon Mug Cake Variations

    You can add other ingredients to add some extra flavors to your mug cake. Here are a few ideas:

    • Berries - Any berry that is lower in carbs will do. Blueberries, strawberries, raspberries, and blackberries are all good choices. They will add some vibrant colors and taste great too. Just add a few berries, and you’ll be set. 
    • Coconut - Sprinkle some coconut in the mug cake or add it to the top for a fun and tropical flavor. 
    • Lime - Add some lime zest to the batter. Don’t go overboard! A little bit will give you so much lemon and lime flavor in every bite!
    • Ice Cream - Put a helping of ice cream on top of the warm cake. As it melts, it tastes phenomenal!
    • Lemon Curd - Drizzle a little bit of homemade keto lemon curd on top of the mug cake. It’s tangy and delicious. 
    • Cream Cheese Frosting - Make a small amount of cream cheese icing and spread on top and then add some raspberries. This combination is amazing!

    close up of a bite of keto lemon mug cake with raspberries

    Can I Share This Mug Cake?

    Sure! You certainly can share this keto lemon mug cake if you want to. However, like most mug cake recipes, it’s intended to be an individual serving size. I understand that sometimes you may just need a little taste or two instead of the entire mug cake. After you cook the mug cake, simply divide the cake in half and share it with another lemon lover!

    How Do You Store Leftover Lemon Cake?

    If there happens to be leftover mug cake left, you can save it instead of tossing it out. You’ll need to cover the mug cake or put it in a plastic or glass food storage container with a lid. Refrigerate it for 2-3 days. You can warm it back up in the microwave if you want to eat it warm. Heat it for 10 -20 seconds and enjoy it!

    lemon mug cake with thawed frozen raspberries and the juice soaking into the cake

     

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    keto lemon mug cake on a plate with a bite on a fork

    Keto Lemon Mug Cake

    After the first taste of this fluffy Keto Lemon Mug Cake, it will become your new go-to dessert. This perfect single-serving sized dessert is great for all occasions and simple to make. 
    Print Recipe Pin Recipe Rate Recipe
    Prep Time: 2 minutes
    Cook Time: 1 minute
    Total Time: 3 minutes
    Course: Dessert, Snack
    Cuisine: American
    Servings: 1
    Calories: 248
    Author: Taryn

    Ingredients

    • 1 tablespoon butter softened
    • 2 tablespoon coconut flour
    • 1 tablespoon sour cream
    • 1 egg
    • 1.5 tablespoon Joy Filled Eats Sweetener (or see alternatives in recipe notes)
    • ½ teaspoon lemon extract
    • ¼ teaspoon baking powder
    US Customary - Metric
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    Instructions

    • Mix well in a microwave-safe mug.
    • Microwave for about 1.5 minutes until fluffy and moist but not wet.

    Notes

    Nutrition: this single-serve mug cake has 4 NET carbs.
    Prep: if your butter is cold simply microwave it in the mug for 15 seconds before adding the other ingredients.
    To Reheat: microwave for 10-20 seconds. Be sure not to heat too long, or it will harden the mug cake. 
    To Freeze: place the mug cake in a container that is airtight and freeze for up to 1 month. 
    Notes on Sweeteners: 
    I use my own blend of xylitol, erythritol, and stevia in my recipes. This is twice as sweet as sugar. It is comparable to Trim Healthy Mama Gentle Sweet and Truvia.
    To sub in Swerve or Lakanto Monk Fruit use 1.5 times the amount of sweetener called for. 
     
    To sub in Pyure or Trim Healthy Mama Super Sweet use half the amount of sweetener called for.
     
    Substitutions will work in most recipes. They may not work in candies, such as caramel.

    Nutrition

    Serving: 1mug cake | Calories: 248 | Carbohydrates: 9g | Protein: 8g | Fat: 20g | Saturated Fat: 12g | Cholesterol: 200mg | Sodium: 204mg | Potassium: 187mg | Fiber: 5g | Sugar: 1g | Vitamin A: 667IU | Calcium: 92mg | Iron: 1mg
    Tried this Recipe? Tag me Today!Mention @joyfilledeats or tag #joyfilledeats!

    More Delicious Mug Cake Dessert Recipes

    • Keto Cinnamon Mug Cake
    • Healthy Mug Cake with Cranberries
    • Keto Peanut Butter Mug Cake
    • Cannoli Mug Cake
    • Keto Mug Brownie

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    Comments

    1. Suze M says

      February 27, 2022 at 2:50 am

      I made one each for hubby and I tonight. My microwave may be higher watts - it was a little dry at a 90 seconds. but tasted great! I will back off in 15 second increments until it's just right. Even hubs liked it and he's not keto lol. Thank you so much!!5 stars

      Reply
    2. Becky says

      February 25, 2022 at 11:28 pm

      Is this cake light or is it Dense like when using almond flour? Do you think 1/2 lupin 1/2 coconut flour will make it less dense? I just cant handle almond flour for things like this because of how dense it turns out.

      Reply
      • Taryn says

        February 26, 2022 at 5:41 pm

        This is a lot lighter than an almond flour cake. I'm not familiar with lupin flour so I'm not sure if that would work, sorry.

        Reply
    3. Cindi says

      January 21, 2022 at 11:46 am

      Great recipe! Exactly what I was looking for. I appreciate you putting how to save or freeze with these too.5 stars

      Reply
    4. Tammy says

      July 18, 2021 at 7:19 pm

      Delicious! I softened 1T of cream cheese added a tad of gentle sweet and a dash of raspberry extract for a topping. So good!5 stars

      Reply
    5. Linda says

      June 10, 2021 at 1:18 am

      Can I use all purpose flour?

      Reply
      • Taryn says

        June 10, 2021 at 11:38 am

        In theory, yes, but you would need more and I'm unsure of the amount. But since it is a single-serve recipe it would be easy to test it. Just try using twice the amount of coconut flour in wheat flour. If it doesn't work the first time you may need a little more.

        Reply
    6. Carrie Y. says

      May 21, 2021 at 10:14 pm

      Can I sub almond flour for coconut flour in this recipe?

      Reply
      • Taryn says

        May 22, 2021 at 12:11 pm

        You can use this recipe and add lemon extract or zest joyfilledeats.com/keto-vanilla-mug-cake

        Reply
      • Sheri says

        June 11, 2021 at 10:10 am

        Is there a way to make this dairy free?

        Reply
        • Taryn says

          June 11, 2021 at 8:54 pm

          Yes, sub coconut oil for the butter and coconut cream for the sour cream.

    7. Tammy L Lemery says

      March 05, 2021 at 4:15 pm

      Delicious 😋 thank you for sharing your amazing recipe.. I look forward to trying more of them and following you..
      Tammy 🙂

      Reply
    8. carrie says

      September 20, 2020 at 12:56 pm

      just made this today and had it for my snack it was so yummy

      Reply
    9. Chrissy says

      September 11, 2020 at 3:02 pm

      Yum! I ended up using allulose as the sweetener as that's what I had on hand today. Really love the bright lemon flavor from the lemon extract. 🙂5 stars

      Reply
    10. Sandi says

      September 11, 2020 at 12:38 pm

      What a delicious cake. I was able to use a fresh lemon from my tree to make this.5 stars

      Reply
      • Donna Neel says

        January 29, 2022 at 6:36 pm

        How much fresh lemon juice would you use? Would a little lemon zest be a good idea?

        Reply
        • Taryn says

          January 31, 2022 at 10:11 am

          Fresh lemon juice isn't potent enough. You can sub in lemon zest for lemon extract 1:1.

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