This keto brownie in a mug is super fudgy, chocolatey, egg free and gluten-free. Best of all, it cooks in the microwave in just 60 seconds.
Aren't mug cakes just the most brilliant invention? I think the ability to produce a healthy single serve cake in 3 minutes from start to finish is nothing short of a miracle.
I have a whole bunch of keto mug cakes on my website already. We love the chocolate mug cake, this peanut butter mug cake, my vanilla keto mug cake and also the coconut flour mug cake.
I have even made a mug cheesecake. As you can see, I am taking mug cakes seriously.
But I have to say, this one is special. It is so fudgy, satisfies the strongest chocolate cravings and tastes incredible with a scoop of sugar free ice cream or a dollop of whipped cream.
If you are looking for a quick low carb dessert, this recipe is one to try!
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🌟 Why You'll Love This Recipe
- Fudgy and gooey
- Ultra chocolatey
- Easy - only 6 ingredients
- Quick - cooks in 60 seconds
- Sugar-free and keto friendly - 5.6g net carbs
- Dairy-free
- Egg free
- Gluten-free
Ingredients
Here are the ingredients you'll need for a keto mug brownie recipe:
Peanut Butter - Must be runny and smooth. This is absolutely essential! Hard peanut butter will result in a dry brownie. I like to use brands that are 100% peanuts. You can also use almond butter or any other nut or seed butter.
Coconut Flour - Can be replaced with 3x the amount of almond flour.
Unsweetened Cocoa Powder
Powdered Sweetener - I used a powdered erythritol monk fruit sweetener blend. Pure erythritol, allulose, Swerve or Bocha Sweet also work.
Milk - Any nut or seed milk of your choice. I used almond milk.
Baking Powder - To give the brownie a nice lift.
Optional: Pinch of Salt - Either stir it into the brownie batter or sprinkle a few flakes over the top. You can also add a few drops of vanilla extract.
Optional: Sugar Free Chocolate Chips - Lily's is a popular brand. Or simply chop up a square of 90% dark chocolate such as Lindt.
Instructions
This section contains step-by-step instructions and photos that show how to make this recipe. See the recipe card for full information on ingredients and quantities
- Get a mug.
The "mug" can be any microwave-safe mug or bowl such as a ramekin. My ramekin had a diameter of 3 inches. Option to lightly grease it to prevent sticking.
2. Mix the batter.
In a small bowl, stir together the dry ingredients with a fork. Break up any clumps.
In another small bowl, whisk the nut milk and the peanut butter.
Then, add the dry ingredients to the wet and stir until a brownie batter forms.
Last, fold in the chocolate chips and fill the batter into the prepared mug or ramekin.
3. Microwave.
Microwave the keto mug brownie until it is done. That's it!
Top Tip
I first tested the brownie after 45 seconds. For all of you who like theirs super fudgy, this may already be enough.
Also, keep in mind that mug cakes continue to cook in the hot cup after microwaving.
So, don't be tempted to overcook! Add increments of 10 seconds if necessary.
Microwave Timings
Microwave timings will vary according to the wattage of your microwave. Mine operates at 900 Watt.
Below are suggested timings for different power strengths:
- 600W = low power. 80 seconds
- 800W = 70 seconds
- 900W = 60 seconds.
- 1000W = 50 seconds
- 1200W = 35-40 seconds
Recipe FAQs
Choose a mug, bowl or ramekin that is wide rather than narrow and tall. Never fill it more than ⅔. Always have a few fingers of space at the top. The batter rises as it cooks and can overspill.
Yes. To make a keto brownie mug cake in the oven, bake at 180C (160C fan) / 350F for around 9 minutes. The less you bake it, the fudgier it will be.
Yes. Air fry at 170F / 320F for around 7 minutes.
Use 2 tablespoons of almond flour instead of the coconut flour.
Any seed or nut butter can be used, such as almond butter.
Variations and Substitutions
Below are a few ideas how you can change the flavor:
Caramel swirl brownie: Stir in a swirl of sugar free caramel sauce.
Raspberry brownie: Press a few fresh raspberries into the batter.
Add an egg: This makes it fluffier, with a cake-like texture.
Mocha: Swap out 1 tablespoon of the almond milk with strong coffee. Or, add ¼ teaspoon coffee extract.
Nuts: Add walnuts or pecans into the batter.
Storage
Since this keto brownie in a mug is a single serve recipe, you will probably eat it straight away.
It is possible to store it in the fridge for up to 5 days though. Store in an airtight container.
You can even freeze it for up to 3 months. Defrost overnight.
Related Recipes
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Recipe
Sugar Free Mug Brownie
from Sugar Free LondonerNote: The servings slider only changes the first amount in each line and not any subsequent amounts. Please make your own calculations where necessary.
Equipment
- microwavable mug or ramekin
Ingredients
- ½ tablespoon coconut flour
- 1 tablespoon cocoa powder unsweetened
- 1 tablespoon powdered sweetener
- ⅛ teaspoon baking powder
- 1.5 tbsp peanut butter must be smooth and runny
- 3 tbsp almond milk or any nut or seed milk
- 1 tablespoon sugar free chocolate chips optional
- pinch of sea salt optional
Instructions
- Lightly grease a microwavable mug or ramekin (3 inch diameter).
- I a small bowl, stir together the coconut flour, cocoa powder, baking powder, sweetener and optional pinch of salt with a fork. Break up any clumps.
- In another small bowl, combine the nut milk and the peanut butter. Then, add the dry ingredients to the wet and stir until a brownie batter forms.
- Last, fold in the chocolate chips and fill the batter into the prepared mug or ramekin. Microwave on high for 60 seconds (900W). See suggested microwave timings in the notes below.
Notes
- 600W = low power. 80 seconds
- 800W = 70 seconds
- 900W = 60 seconds.
- 1000W = 50 seconds
- 1200W = 40 seconds
Kayley Burns
What a treat, tastes lush! I used hazelnut butter instead of peanut. I cooked in oven for 20mins should have covered it as slightly caught a bit of it. X3 the recipe to do a large brownie. Thank you!!
Robin R Snyder
KAYLEY, what size pan to make a large brownie?
Katrin
oooh - can't wait to make that one!!
Donna Bradley
This was a quick and yummy fix to my brownie cravings