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Keto Mug Brownie

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4.89 from 285 votes
By Carine -

An easy keto mug brownie recipe for a 90-second chocolate craving fix with only 5 grams of net carbs! Plus, this fudgy keto mug brownie is also gluten-free and nut-free, made with coconut flour.

Who is craving a keto brownie recipe but doesn’t feel like spending 30 minutes in the kitchen?  I’m sure you do, and that’s why you should make this  keto mug brownie:

  • Ready in 90 seconds
  • Nut-free
  • Dairy-free
  • Gluten-free
  • Low-carb

What’s a keto mug brownie?

A keto mug brownie is a brownie recipe baked in a coffee mug in only 90 seconds in your microwave.

Keto brownie mug cakes are the ideal single-serve snack on a keto diet to fix a cake craving without eating sugar, carbs, and minimal baking time.

keto brownie mug cakeketo brownie mug cake

How to make a mug brownie?

This keto chocolate mug brownie recipe is the easiest keto baking recipe ever!

It takes barely 2 minutes to whip, and the ingredients you need to make this keto mug cake are pretty basics keto ingredients.

  • Egg 
  • Coconut flour – this is a nut-free keto mug brownie recipe using only a tiny bit of coconut flour: you only need 2 teaspoons, scooped and swept! Teaspoons, not tablespoons, don’t get confused, or your keto low carb mug brownies will be very dry. In fact, coconut flour is a low-carb flour with a very high-fiber amount, and too much of it sucks up all liquid in the recipe resulting in a crumbly brownie.
  • Unsweetened cocoa powder
  • Erythritol – or keto sweetener you love.
  • Melted butter or melted coconut oil for a dairy-free option.
  • Vanilla extract
  • Sugar-free dark chocolate chips

Preparing the batter

First, to make this low-carb keto-friendly brownie in a mug, you need to beat egg with melted butter and vanilla extract.

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Keto chocolate mug brownies

Then, gently whisk in the dry ingredients starting with unsweetened cocoa powder – watch out. It burst out of the bowl easily.

Finally, whisk in sweetener and coconut flour, and baking powder.

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Transfer the keto brownie batter to a tall coffee mug or wide microwave-safe ramekin.

Microwaving the mug cake

Bake in the microwave on 900W for 60-80 seconds – baking time varies depending on the texture you want to achieve for your keto mug brownie.

  • For a fudgy keto brownie in a mug recipe – bake 60-70 seconds. It results in a soft, almost lava center.
  • For a cake-like brownie texture – bake for 80-90 seconds. The crumb will be set like a cake, bouncy, still moist but firmer.

How does it taste?

A keto mug brownie has a strong chocolate flavor and a fudgy moist chocolate crumb.

Depending on how long you microwave your brownie, you can achieve a different level of fudginess. Play with baking time from 60 seconds to 90 seconds to enjoy different keto mug brownies.

easy keto mug brownie

Can I make ahead mug brownies?

You can make the batter ahead and store it for up to 24 hours in a sealed container in the fridge. However, you can’t store your keto mug brownie after it has been baked in the microwave.

In fact, microwave baked goods dry out very fast and won’t last more than 30 minutes. After that time, their texture change too much to be enjoyable.

Microwave setting

The key to making a fudgy mug brownie is to learn from your microwave settings first! In fact, if you are new to microwave baking, you should know that a microwave has the same power settings as an oven.

They run on different power ranges, from 600W to 1200W in general.

As a result, never make a keto mug cake recipe following the recipe baking time without checking your microwave power first!

Below are some of the general rules to bake with the microwave-based on their powder.

  • 600W – 90 seconds
  • 900W – 70 seconds
  • 1200W – 60 seconds

Oven baking option

Of course, if you don’t have a microwave but still crave this delicious keto mug brownie, I have an oven option for you.

First, preheat your oven to 350F (180C).

Then, select a single-serve oven-safe ramekin or small round cake pan. Grease it with coconut oil and lay a piece of parchment paper at the bottom if you use an aluminum pan.

Finally, bake this mug brownie in the center rack of the oven for about 18 minutes or until a pick inserted in the center of the mug brownie come out with a little to no crumb on it!

Cool it down and enjoy!

Keto mug brownie serving ideas

Before adding any topping to your mug brownie, let it steam out at room temperature for 1 minute.

During this time, the low-carb mug brownie texture is setting nicely, and the top dries out, creating the particular brownie ‘crust’ that we all love in a keto brownie.

keto friendly brownie in a mug

Then, there are two options:

  • Eat the brownie in the mug.
  • Flip the keto mug brownie onto a plate – that’s messy and not my favorite!

Finally, time to add some toppings to make it even tastier. In fact, keto mug cakes, in general, tend to dry out fast, so it’s always tastier to serve them with a moist topping to balance their texture.

The best mug brownie toppings are:

  • Unsweetened whipped cream – you can use coconut cream if dairy-free or vegan.
  • Sugar-free chocolate chips – add few more sugar-free chocolate chips on the hot brownie. They will melt and add a touch of sweetness!
  • Sugar-free vanilla ice cream – a scoop of keto ice cream will be delicious on top of this.

Flour swap

Can I make this keto brownie in a mug with almond flour? Yes, sure! But the ratio of almond flour to achieve a similar keto mug brownie texture is pretty different.

keto chocolate mug brownie

In fact, almond flour and coconut flour are both low-carb flours but with different properties, different amount of fat, proteins, and fiber.

So to replace 2 teaspoons of coconut flour in this recipe, you must use 3 tablespoons of ultra-fine almond flour.

More keto mug cake recipes

If you love keto mug cake recipes as a quick keto snack or keto desserts, I have plenty of other keto mug cake flavors for you to try.

Did you make this keto brownie in a mug? Share a comment or review below or for a larger serve, try my keto brownie recipe !  I love to hear your feedback on my keto recipes.

XOXO Carine

Recipe Card

Keto Mug Brownie

keto mug brownie
5.2gNet Carbs
4.89 from 285 votes
Prep Time: 3 mins
Cook Time: 1 min
Total Time: 4 mins
Net Carbs 5.2g
Fat 7.5g
Protein 9.6g
Calories 136.5kcal
Author: Carine Claudepierre
1 mug brownie
A fudgy keto mug brownie with coconut flour, dairy-free gluten-free for a quick keto mug cake to fix your chocolate craving on a keto diet.

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Net Carbs
4.89 from 285 votes
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  • In a small bowl, beat the egg, melted butter, and vanilla extract.
  • Whisk in unsweetened cocoa powder, coconut flour, erythritol, and baking powder.
  • The batter should be smooth and shiny. Now stir in sugar-free chocolate chips and transfer them to a tall coffee mug - volume 8-12 fl oz - or into a microwave-safe ramekin.
  • Microwave on high power (900W) for 60 seconds for a fudgy brownie or 70-80 seconds for a cake more like texture. You can start with 60 seconds, check, and keep baking in the microwave by 20-second bursts until it reaches your favorite texture.
  • Cool down for 1-2 minutes before eating. This will allow the brownie to cool down a bit and the texture to be perfectly fudgy. Optional: sprinkle extra chocolate chips on top as it cools down.
  • Serve with unsweetened whipped cream.
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Nutrition Facts
Keto Mug Brownie
Amount Per Serving (1 mug brownie)
Calories 136.5 Calories from Fat 68
% Daily Value*
Fat 7.5g12%
Saturated Fat 3.8g24%
Trans Fat 0.1g
Polyunsaturated Fat 1g
Monounsaturated Fat 2.3g
Cholesterol 186mg62%
Sodium 199.9mg9%
Potassium 221.6mg6%
Carbohydrates 12g4%
Fiber 6.8g28%
Sugar 1.1g1%
Protein 9.6g19%
Vitamin A 270IU5%
Vitamin B12 0.5µg8%
Vitamin D 1µg7%
Calcium 99.6mg10%
Iron 2.6mg14%
Magnesium 56.2mg14%
Zinc 1.3mg9%
Net Carbs 5.2g
* Percent Daily Values are based on a 2000 calorie diet.

Keto Mug Brownie

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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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