Keto Blueberry Shortcake in a Mug

Annie Lampella @ Ketofocus

By Annie Lampella, Pharm.D.

Published August 7, 2021 • Updated February 1, 2026

Reader Rating
3 Stars (2 Reviews)

This post may contain affiliate links. See my disclosure policy.

Toss blueberries in a mug and cover them in a gluten-free, low-carb shortcake batter. This blueberry shortcake in a mug is ready in just five minutes and tastes soft and fluffy, just like a fancy cake from the bakery.

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Keto Blueberry Shortcake in a Mug

3 (2) Prep 5m Cook 2m Total 7m 1 servings

Ingredients

Step by Step Instructions

Step by Step Instructions

1
Make shortcake batter

Mix together almond flour, coconut flour, vanilla syrup, butter, baking powder and salt in a small bowl. Set aside.

holding shortcake batter with a spoon
2
Add blueberries

Spray cooking spray into a large ramekin or microwave safe mug. Add blueberries to the dish.

blueberries in a ramekin
3
Top with shortcake batter

Scoop shortcake mixture to the top of the blueberries. Microwave for 1 minute. Serve with homemade whipped cream or ice cream.

shortcake batter in a ramekin
Nutrition Per Serving
251 Calories
20.1g Fat
5.1g Protein
6.8g Net Carbs
13.7g Total Carbs
1 Servings
Nutrition disclaimer

The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.

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Keto Blueberry Shortcake in a Mug

Frequently Asked Questions

Can I use frozen blueberries instead of fresh ones?

Yes! Frozen blueberries work great here. Let them thaw slightly and drain any excess moisture before adding them to your mug.

What can I substitute for the almond flour?

Sunflower seed flour is the best nut-free swap -- it measures cup for cup with almond flour. A low-carb all-purpose blend works too, but the texture will be a little different.

How should I store leftovers if I have any?

Store any leftovers in an airtight container in the fridge for up to 2 days. Reheat in the microwave for a few seconds before eating.

Is this recipe suitable for a vegan diet?

Swap the butter for a vegan butter or coconut oil, and use sugar-free maple syrup instead of the vanilla syrup. That's it.

How can I make this recipe sweeter?

Add a bit more sweetener (erythritol or stevia) to the batter. Start small and taste as you go.

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Low Carb Shortcake Recipe

a ramekin with blueberry shortcake in it and berries nearby

Sweet and soft, this keto blueberry shortcake in a mug is the perfect summer dessert. The first bite is all fresh blueberry juice and buttery cake, and it only gets better from there.

It’s quick and easy to make. Since it’s made in a mug, it’s naturally portion-controlled. The total net carb count is just 5 grams, so you get a real dessert without blowing your macros.

I love this shortcake with tea or coffee. You can also serve it with keto ice cream. Warm cake plus melting ice cream is hard to beat.

Your kitchen will smell amazing while this bakes. Blueberries and warm cake are a great combo.

whipped cream and berries on top of a mug cake

Are Blueberries Low Carb?

Berries are one of the best fruits on keto. Fresh blueberries have slightly more carbs than raspberries or strawberries, but they still fit just fine. They have 12 grams of carbs per 100 grams (about 3 handfuls). Just keep portions small since the carbs add up fast. I use 8-10 blueberries in my mug cake, which comes out to 1-2 grams of net carbs.

They are also healthy and nutritious with a generous amount of fiber, vitamin C and antioxidant anthocyanins.

Flour Options

In this recipe, I use a mixture of almond and coconut flour to keep it low-carb. If you need a nut-free option, you can use sunflower seed flour instead. It measures cup for cup with almond flour.

Also, make sure that you don’t use coconut flour alone. Coconut flour is quite absorbent and it can make the cake dry out. So, always add it in combination with another flour such as almond or sunflower seed flour. If the batter feels too dry, you can add a few drops of water to make it smoother.

Oven Instructions

Usually, mug cakes are baked in the microwave. Microwave the mug cake for 1 minute in an 800-watt microwave. Once it’s out of the microwave stick a spoon inside to check if the ingredients are still wet or if the cake doesn’t seem springy. You can put it back for another 10 seconds if needed. If you are not using a microwave, you can bake blueberries at 350 degrees for 8-10 minutes.

When the mug cake is done, you can add a dollop of homemade whipped cream and enjoy it directly from the ramekin. If you want to get a little fancy, turn it out into a plate and serve it with ice cream.

whipped cream on top of a short cake with blueberries and purple flowers

What to Bake the Shortcake in -- Mug or Ramekin?

You can bake your mug shortcake in either mug or ramekin. Usually, I prefer a ramekin as it ensures that the cake is baked evenly. Also, a ramekin is preferred over a mug if you’re baking in the oven as a glass mug can crack due to the high temperature in the oven. For this recipe, you should use an 8 oz or larger ramekin. Spray the inside of the ramekin or mug with cooking spray or rub it with oil so that the batter doesn’t stick to the mug.

Tips to Make the Best Keto Blueberry Shortcake

First off, you should remember not to overmix the batter. Otherwise, the cake can become dense instead of soft and fluffy. If you are using frozen blueberries, you must thaw them first. Then, drain any excess juice. If you want to add a lemony touch to your blueberry mug cake, try adding a tablespoon of fresh lemon juice along with a teaspoon of lemon zest. This will add a slight zing to the sweetness of blueberries and cream.
About the Author
Annie Lampella, Pharm.D.

Annie Lampella, Pharm.D.

Annie is a Doctor of Pharmacy, mom, and the recipe creator behind KetoFocus. With a B.S. in Genetics from UC Davis, she has over 14 years of experience developing family-friendly keto recipes based on the science of human metabolism.

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  1. Annie Lampella
    Annie Lampella May 29, 2025

    You could use all almond flour instead, but you will definitely need to add more. I would say about 1/2 -2/3 cup more almond flour. Another option is to use oat fiber in place of the coconut flour. I've been using it to give my keto baked goods a better texture. Try using 2 tablespoons of oat fiber. Let me know how that works.

  2. M
    Marie Apr 28, 2025

    Made this recipe using greek yogurt instead of vanilla syrup. Delicious! Added a few teaspoons of sweetener too.

  3. K
    Krystin Sawyer Aug 24, 2021

    Is this recipe complete? It doesn’t list any liquids. Usually at least an egg or two is needed to make the cake. Also, is it 2 tablespoons of coconut flour or teaspoons? Usually much less coconut flour is needed, which is why I asked.

    1. Annie Lampella
      Annie Lampella Aug 27, 2021

      This is a recipe I developed for ChocZero. I did accidently put in monkfruit sweetener instead of the ChocZero vanilla syrup as the sweetener but I have changed that to make up for more liquid. You can watch this video to see that it has plenty of liquid. https://youtu.be/lkrVU_thXOY

  4. T
    T Aug 24, 2021

    Terrible.
    You state "not to overmix the batter," yet there is only one tablespoon of melted butter to bind four tablespoons of flour -- two of those tablespoons are super absorbent coconut flour!!!
    Without any fat binder, this is nothing but a dry, crumbled mess.

    1. Annie Lampella
      Annie Lampella Aug 27, 2021

      Thank you for bringing this to my attention. I have updated this recipe. The original one I developed for ChocZero uses their vanilla syrup. I replace the sweetener for the syrup. https://youtu.be/lkrVU_thXOY It should work perfectly if you use the syrup.

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