keto brownie in a mug

Have you ever heard of a keto chocolate mug cake? Well, this keto brownie in a mug is just as convenient but better. It’s rich and fudge-y and is a true single-serving. No need to bake up a batch of brownies at 10 o’clock at night- just mix up a few ingredients in a mug, pop it into the microwave for about a minute, and you’ve got yourself an easy, decadent treat that is also gluten-free and vegan.

Top it off with a scoop of your favorite keto-friendly ice cream and this amazing chocolate sauce for a delicious keto brownie sundae!

why you’ll love this brownie in a mug

I love a basic keto mug cake but I never can really finish the whole thing- my husband I and will either share it or I’ll save half of it since it’s really enough for two servings. This brownie in a mug is a smaller portion and doesn’t require an egg, which means it’s not quite as filling and is also vegan-friendly!

Let’s talk about the texture. Super moist, tender and fudge-y– gooey as any good brownie should be. Sprinkle in a few sugar-free chocolate chips for warm, melted, chocolate-y goodness in each big bite.

Plus, it’s a great recipe to make with kids! When they each get to make their own keto brownie mug cake, there’s much less sibling squabbling in the kitchen! 😉 Just saying. So many reasons to love this recipe…

how to make a brownie mug cake

The best part about this keto brownie in a mug is that it’s ready in a matter of minutes!

You will need:

Combine all of the ingredients into a microwave-safe mug, mix it with a small whisk or a fork, and then cook it in the microwave. I don’t often turn to the microwave for my baking needs, but I make an exception for this one. 😉

  1. Mix the wet ingredients. In a microwave-safe mug, use a fork (or tiny whisk if you have one) to stir together the almond butter and monk fruit sweetener until it’s well combined. Mix in the coconut cream and vanilla.
  2. Add the dry ingredients. Stir in the cocoa powder, then add the almond flour, coconut flour, baking powder and pinch of salt. Mix well until the mixture resembles cake batter. I like to use a small spatula to scrape down the sides. Stir in the chocolate chips (optional).
  3. Microwave! Microwave the mug brownie for 45-55 seconds (check it after 45). It should look slightly gooey but overall, cooked and a bit springy to the touch. Let it cool for 3-5 minutes before enjoying, as it will be very hot!

for the BEST keto brownie mug cake

Another thing about this keto mug cake recipe: it’s pretty hard to mess up. It’s sort of a foolproof method, so long as you measure the ingredients correctly. Still, here are a few notes on sweetener substitutions and why you should opt for Dutch process cocoa powder instead of a natural unsweetened cocoa.

Sweetener substitutions: You can easily swap in plain erythritol (like Swerve) for the granulated monk fruit sweetener. Granular allulose will also work, but I recommend using 1-1/2 to 2 tablespoons since allulose isn’t as sweet.

Why Dutch process cocoa powder? Dutch process cocoa powder is smooth with a rich, chocolate flavor. It’s also referred to as alkalized cocoa powder. It dissolves easily and since it is alkalized, it is often paired with baking powder in recipes. On the other hand, natural cocoa powder is a bit more bitter and acidic (and usually paired with baking soda). You can read all about the difference here, on Sally’s Baking Addiction. I recommend using Dutch processed cocoa powder in this recipe– you will end up with a mug brownie that has a better flavor and texture all around.

And for a keto brownie mug cake sundae, top the cooled brownie in a mug with a scoop of your favorite sugar-free ice cream and this keto chocolate sauce-also delicious and also keto/vegan! (Do yourself a major favor and make a batch of that chocolate syrup in advance to have on-hand for those moments when ya need an extra dose of chocolate!)

Let me warn you: there’s a good chance this mug brownie will become your go-to sweet indulgence! It’s just that good and easy to make. Enjoy!

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*This post contains Amazon affiliate links. I earn a small commission (at no extra cost to you) when you purchase something from one of those links. I will always recommend brands and products that I use and love. Thank you for supporting Stem and Spoon! -Abby

keto brownie in a mug

keto brownie in a mug

Yield: 1 serving
Prep Time: 5 minutes
Cook Time: 1 minute
Total Time: 6 minutes

This keto "brownie in a mug" is gooey, rich and chocolate-y, and only takes a few minutes to make! Microwave the mug brownie for one minute for a sweet indulgence that is also gluten-free, grain-free and vegan.


  • 1 tablespoon almond butter (choose a brand with no added sugar)
  • 1-1/2 tablespoons granulated monk fruit sweetener (I prefer Lakanto Golden monk fruit)
  • 2 tablespoons coconut cream (the thick cream at the top of a can of coconut milk)
  • 1/2 teaspoon vanilla
  • 1-1/2 tablespoons unsweetened Dutch process cocoa powder
  • 2 tablespoons almond flour
  • 1/4 teaspoon coconut flour
  • 1/4 teaspoon baking powder (preferably gluten-free and aluminum-free)
  • pinch of salt
  • 1 tablespoon sugar-free chocolate chips (optional)

for a brownie mug sundae


  1. In a microwave-safe mug, use a fork (or a mini whisk if you have one) to stir together the almond butter and monk fruit sweetener until it's combined and crumbly. Mix in the coconut cream and vanilla, the mixture should be smooth.
  2. Add in the cocoa powder, then the almond flour, coconut flour, baking powder and a pinch of salt. Stir the brownie mug mixture together- use a small spatula to scrape down the sides of the mug. The mixture should resemble thick cake batter. Stir in the chocolate chips.
  3. Microwave the mug brownie on high for 45-55 seconds. I usually check it after 45 seconds (you may need a towel or oven mit to remove the mug from the microwave). When it's done, the mug brownie should appear slightly gooey but cooked and a bit springy to the touch.
  4. Allow the mug brownie to cool for 3-5 minutes before serving, as it will be extremely hot. It is best served warm.
  5. If making a mug brownie sundae, top with your favorite keto-friendly vanilla ice cream and chocolate sauce.


Make sure to use a microwave-safe mug (a standard size mug works great) or ramekin. You do not want something that is too shallow, as the brownie will cook and bubble up in the microwave and could potentially boil over a shallow dish.

Even a microwave-safe mug can get really hot during the cook time so be careful when removing the keto mug brownie from the microwave oven.

For a peanut butter version, substitute the almond butter for an equal amount of all-natural peanut butter.

Dutch process cocoa powder is preferred due to its reaction with baking powder and its smooth, silky texture and flavor.

Nutrition Information:
Yield: 1 Serving Size: 1
Amount Per Serving: Calories: 294Total Fat: 24gSaturated Fat: 9gTrans Fat: 0gUnsaturated Fat: 0gCholesterol: 0mgSodium: 11mgCarbohydrates: 13gNet Carbohydrates: 5gFiber: 8gSugar: 1gProtein: 9g

This nutritional information is approximate and is provided for convenience as a courtesy.

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