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90-Second Keto Blueberry Mug Cake

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4.87 from 107 votes
By Carine - - 3 Comments

This Keto Blueberry Mug Cake is a moist microwave keto cake in a mug ready in 90 seconds to fix all your sweet cravings in no time.

Bonus, one of these keto mug cakes contains only 3.5 grams of net carbs, so you can indulge without maxing out your macros.

Keto blueberry muffin in a mug

What’s a Keto Blueberry Mug Cake?

A keto blueberry mug cake is a keto blueberry cake in a mug, baked in 90 seconds in your microwave. It’s the best keto snack to fix your cake craving quickly with few carbs, no sugar, and gluten-free.

How to make a keto blueberry mug cake?

This recipe makes two moist keto muffins baked in a mug. To make this easy keto mug cake recipe, you need:

  • Large egg
  • Almond flour – use ultra-fine almond flour with a golden color. If you prefer to use coconut flour, use my coconut flour mug cake recipe and add blueberries to the batter.
  • Erythritol or any keto sweetener you love.
  • Unsweetened almond milk
  • Baking powder
  • Vanilla extract
  • Blueberries – fresh or frozen and an extra 1/2 teaspoon of coconut flour to roll the keto-friendly berries and prevent them from sinking in the bottom of the coffee mug.

Combine dry ingredients to wet ingredients

In a small bowl, beat egg, almond milk vanilla. Then, stir in baking powder, almond flour, and erythritol until a thick batter forms.

In another bowl, stir the blueberries with coconut flour. This is optional, but it prevents the blueberries from sinking to the bottom of the mug.

How to make keto blueberry muffins IN A MUG

Fold in the blueberries and split the keto blueberry muffin batter evenly into two tall coffee mugs. It is essential to use tall coffee mugs because the muffins will rise and might overflow from the mugs.

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Bake in the microwave

This recipe is baked in the microwave for a quick 90-second keto snack. To achieve a moist mug cake, you must bake this recipe:

  • One mug at a time – don’t place both mugs in the microwave at once, or they won’t bake evenly.
  • Set the microwave on high powder  800 W-900W.
  • Microwave for 80 seconds first.
  • Keep baking for an additional 10 seconds if it is still wet in the center.


Place one coffee mug in the center of the microwave. Set the microwave power to high/800W and microwave the keto blueberry muffin mug cake recipe for 80-90 seconds each, until it is set on the top and has doubled in height.

Keto blueberry mug cake

Cool down

Remove the low-carb blueberry mug cake from the microwave and cool down 1 minute before eating. You can eat it in the mug itself or flip it over a plate to cool down quickly.

Carine from Sweetashoney

Hi! Do you need help to start Keto?

By Carine from Sweetashoney

How to serve your mug cake?

This quick and easy mug cake is delicious topped with:

  • Unsweetened whipped cream
  • Extra blueberries
  • Sliced almonds
  • Powdered erythritol
  • Drizzle peanut butter
  • A dollop of cream cheese

Keto blueberry muffin mug cake

How to store mug cakes?

This easy recipe for blueberry mug cake serves 2 mug cakes.

To store the extra mug cake batter, place the uncooked batter in a sealed container or into a tall coffee mug and wrap the top with film wrap.

Refrigerate for up to 48 hours. Microwave it just before eating.

Keto blueberry cake in a mug

You can’t store a mug cake baked in the microwave for more than 30 minutes. After that time, the mug cake becomes hard and dense.

Can I use others berries?

Yes, you can replace blueberries with other keto fruits like strawberries, raspberries, or boysenberries.

Can I bake this blueberry mug cake?

Yes, you can bake this keto blueberry mug cake. However, the muffins won’t rise as much as seen in the picture.

Preheat oven to 350F (180C). Divide the batter into two oven-proof ramekins, grease with butter or coconut oil.

Bake both ramekins in the center rack of the oven for 15-20 minutes or until a pick inserted in the center of the cake comes out clean.

Why are berries sinking at the bottom of the mug?

This happens if you didn’t roll the berries into coconut flour before adding the batter. Make sure you roll the berries with 1/2 teaspoon of coconut flour to prevent this to happens.


You can create a range of blueberry mug cake flavor by adding some of the below ingredients into the batter:

  • 1-2 tablespoons of sugar-free white chocolate chips.
  • 1-2 teaspoon chopped almonds.
  • 1 teaspoon lemon zest.
  • 1/2 teaspoon lemon extract.

More keto recipes for mug cakes

Keto mug cakes are the best to fix your sugar craving and cake craving on a keto diet. They are quick to make, tasty, and low in carbs. Below I listed my top keto mug cake recipes for you to try:

Have you made these low-carb keto blueberry muffins in a mug? Share a comment or review below. I love to hear your feedback on my recipes,

XOXO Carine

Recipe Card

Keto Blueberry Muffins in a Mug

Keto blueberry muffin in a mug
3.5gNet Carbs
4.87 from 107 votes
Prep Time: 5 mins
Cook Time: 2 mins
Total Time: 7 mins
Net Carbs 3.5g
Fat 11.5g
Protein 6.3g
Calories 146.8kcal
Author: Carine Claudepierre
2 mug muffins
An easy recipe to make two keto blueberry muffins in a mug in less than 2 minutes.

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Net Carbs
4.87 from 107 votes
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  • 1 large Egg at room temperature
  • 1 teaspoon Vanilla Extract
  • 2 tablespoons Unsweetened Almond Milk or Heavy Cream, at room temperature
  • ½ teaspoon Baking Powder
  • 1 ½ tablespoon Erythritol
  • 4 tablespoons Almond Flour
  • 1 ½ tablespoons Blueberries fresh or frozen
  • 1 teaspoon Coconut Oil melted

To prevent the blueberries from sinking in the mug - optional

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  • In a small bowl, beat egg, vanilla, unsweetened almond milk, and melted coconut oil.
  • Stir in almond flour, baking powder, and erythritol until smooth.
  • In another mixing bowl, stir blueberries with coconut flour. This prevents them from sinking at the bottom of the mug.
  • Fold the blueberries into the batter.
  • Transfer the batter into two tall mug cakes. Your mug cake will rise and double in height, so make sure you are using a tall mug, or the batter will overflow.
  • Bake each mug cake in the microwave, one at a time, power 800W for 90 seconds each. Don't microwave both mug cakes at the same time. Note that if your microwave has higher power, you will need to decrease baking time to avoid a dry mug cake. You can start with 80 seconds, check the texture, and return to the microwave for an additional 10 seconds until it is baked through.
  • Cool 2 minutes before serving to avoid burning yourself.
  • Enjoy directly in the mug. Top with unsweetened whipped cream if desired

Baking method

  • Note that baking this recipe won't result in a similar texture. The muffins won't rise as much. Bake at 350°F (180°C) for 15-20 minutes in 2 oven-proofed ramekins.
  • Insert a skewer in the center of the cake to check if it's baked. If it comes out dry, it is baked.


  • You can't store a mug cake baked in the microwave. The texture will be chewy, eggy after 1 hour.
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Nutrition Facts
Keto Blueberry Muffins in a Mug
Amount Per Serving (1 muffin)
Calories 146.8 Calories from Fat 104
% Daily Value*
Fat 11.5g18%
Saturated Fat 3g19%
Trans Fat 0.1g
Cholesterol 93mg31%
Sodium 161.3mg7%
Potassium 46.2mg1%
Carbohydrates 5.3g2%
Fiber 1.8g8%
Sugar 2g2%
Protein 6.3g13%
Vitamin A 141IU3%
Vitamin B12 0.2µg3%
Vitamin C 1.1mg1%
Vitamin D 0.5µg3%
Calcium 121mg12%
Iron 1.1mg6%
Magnesium 4.2mg1%
Zinc 0.3mg2%
Net Carbs 3.5g
* Percent Daily Values are based on a 2000 calorie diet.

Keto Blueberry Mug cake

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    3 thoughts on 90-Second Keto Blueberry Mug Cake
  1. These mug cakes are so perfect and easy to make for a quick snack or breakfast. Very tasty with some fresh strawberries or blueberries on top !

  2. What size mug(volume) do you suggest? The biggest that I have is 12oz.

    Can I replace the egg with chia egg since I am allergic to eggs? Would I need more baking powder if I didn’t use an egg?

    • The most important is to use a tall coffee mug, 12 oz is fine if it’s tall as a regular coffee mug 95 mm. You can’t make this recipe with egg replacement like chia eggs or any of them, the batter will stay runny and never firm up


The recipes, instructions, and articles on this website should not be taken or used as medical advice. You must consult with your doctor before starting on a keto or low-carb diet. The nutritional data provided on Sweetashoney is to be used as indicative only. The nutrition data is calculated using WP Recipe Maker. Net Carbs is calculated by removing the fiber and some sweeteners from the total Carbohydrates. As an example, a recipe with 10 grams of Carbs per 100 grams that contains 3 grams of erythritol and 5 grams of fiber will have a net carbs content of 2 grams. Some sweeteners are excluded because they are not metabolized. You should always calculate the nutritional data yourself instead of relying on Sweetashoney's data. Sweetashoney and its recipes and articles are not intended to cure, prevent, diagnose, or treat any disease. Sweetashoney cannot be liable for adverse reactions or any other outcome resulting from the use of recipes or advice found on the Website.

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