Keto Mug Brownie (5g Net Carbs)
By Carine Claudepierre
Published on 06/11/2018 - Last updated on 03/07/2025
This recipe may contain Amazon or other affiliate links. As an Amazon Associate I earn from qualifying purchases.
This Keto Mug Brownie is an easy 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.
A keto mug brownie is a brownie recipe baked in a coffee mug in only 90 seconds in your microwave, like my Keto Mug Cake and Almond Flour Mug Cake. 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.
I’ve included the whole recipe card just below, but don’t miss my detailed ingredient selection tips, step-by-step pictures, and tips further down!
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Keto Mug Brownie
Ingredients
- 1 large Egg at room temperature
- 1 tablespoon Salted Butter melted
- ½ teaspoon Vanilla Extract
- 2 tablespoons Unsweetened Cocoa Powder
- 2 teaspoons Coconut Flour or 3 tablespoons of almond flour
- 2 tablespoons Granulated Sweetener
- ¼ teaspoon Baking Powder
- 2 teaspoons Sugar-Free Chocolate Chips + more to sprinkle on top
Instructions
- 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.
Tools
Getting Started What Is Keto? Macro Calculator Sweetener Converter Intermittent Fasting Keto Fruits Keto Vegetables Keto Flours Fighting Keto Flu Healthy SweetenersWant My Kitchen Equipment?
Nutrition
Why You’ll Love This Recipe
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 Option
- Gluten-free
- Low-carb
- Keto-Friendly
Ingredients and Substitutions
It takes only 2 minutes to whip, and the ingredients you need to make this keto mug cake are pretty basics keto ingredients.
- Egg – I choose large free-range eggs.
- 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 – or cacao powder.
- Erythritol – or any crystal keto sweetener you love.
- Melted Butter or melted coconut oil for a dairy-free option.
- Vanilla Extract – for flavor.
- Sugar-Free Dark Chocolate Chips – there are many commercial chocolate chips with no sugar available but you can also make your own with my sugar-free chocolate chip recipe.
How To Make This Keto Mug Brownie
This keto chocolate mug brownie recipe is the easiest keto baking recipe ever!
First, to make this low-carb keto-friendly brownie in a mug, you need to beat egg with melted butter and vanilla extract in a microwave-safe mug.
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 and incorporate the chocolate chips.
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.
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. 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 a few more sugar-free chocolate chips to 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.
- Crushed Pecans, walnuts, or Brazil nuts.
Frequently Asked Questions
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.
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 changes too much to be enjoyable.
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
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 350°F (180°C). 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!
Allergy Swaps
You can make the following swaps to adapt the recipe to your allergies or intolerances.
- Coconut Flour: The ratio of almond flour to achieve a similar keto mug brownie texture is pretty different. In fact, almond flour and coconut flour are both low-carb flours but with different properties, and different amounts 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.
- Erythritol: You can replace the erythritol with any other crystal sugar-free sweetener such as allulose, tagatose, or xylitol or a blend like Swerve that contains erythritol and monk fruit or stevia.
- Butter: You can replace the melted butter with melted coconut oil for a dairy-free keto mug brownie.
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.
About The Author
Hi, I'm Carine, the food blogger, author, recipe developer, published author of a cookbook, and founder of Sweet As Honey.
I have an Accredited Certificate in Nutrition and Wellness obtained in 2014 from Well College Global (formerly Cadence Health). I'm passionate about sharing all my easy and tasty recipes that are both delicious and healthy. My expertise in the field comes from my background in chemistry and years of following a keto low-carb diet. But I'm also well versed in vegetarian and vegan cooking since my husband is vegan.
I now eat a more balanced diet where I alternate between keto and a Mediterranean Diet
Cooking and Baking is my true passion. In fact, I only share a small portion of my recipes on Sweet As Honey. Most of them are eaten by my husband and my two kids before I have time to take any pictures!
All my recipes are at least triple tested to make sure they work and I take pride in keeping them as accurate as possible.
Browse all my recipes with my Recipe Index.
I hope that you too find the recipes you love on Sweet As Honey!
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Disclaimer
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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This is dry dry recipe. The egg was room temp. I am an experienced gluten free cook. Skip this
It was great but it had more of a cake-like texture. Really yummy and satisfied my craving! My only issue is that the calories for this are incorrect. I calculated all the calories and it turned out to be 205 calories not 136.
Calories always depend on precisely the ingredients you use. There’s always variability depending on your own products.
The way I calculate calories and nutrients is by using an industry-standard method and service to give the most accurate values.