Chocolate Keto Mug Cake

The search for the perfect Chocolate Keto Mug Cake – is over. No, seriously. This recipe is so good that the people closest to me who don’t care for chocolate – much less, chocolate cake – actually like this cake. The crazy part about it is how easy it is to make!

How to make Chocolate Keto Mug Cake – Black Tie Kitchen

Microwave is the King

The microwave is THE best instrument for making mug cake. I tried relentlessly to make it work in the oven (mostly because I don’t have a microwave, but that’s besides the point) and time and time again, 60 seconds in the microwave outdid everything in the oven. The microwave simply yields a moister, smoother, quicker cake.

If you’re familiar with the iron triangle of project management, the microwave method basically hits all three sides of the triangle. It’s an anomaly.

Why does the oven suck?

I’m not a food scientist, but this is my guess: since the water molecules are not hyperactive (due to the lack of micro waves hitting them) they are not bouncing around like kids hopped up on sugar, thus it takes longer for them to transition from liquid to mist. So the cake rises slowly – something you would desire in a baked good like cheesecakes. This yields a denser cake, which is not what we are after.

When baking the keto mug cake in the oven, I found the optimal time was 25 minutes at 325F. Yes, 25 minutes – which feels like an eternity when you’re trying to quell a sweet tooth craving and just might dig into that bag of chips if it doesn’t come soon.

What happens when it takes so long in the oven? It dries out. As a result, I would have to end up adding a tad of almond milk to keep it moist – and that screws the ingredient ratios rather substantially because we’re not making an entire cake. Every little bit counts when the contents reside in a mug.

If you learn anything about making Keto Mug Cake, learn this…

Keto mug cake is finicky when cooked in the microwave, super finicky. You have to WATCH the cake as it cooks to figure out when it’s ready. There is literally a 5 second window where the cake goes from an sloppy uncooked mess, to a stiff ass sponge. This is because every microwave has different wattage/power settings/etc.

From what I’ve seen and experimented, it can take anywhere from 50 seconds to 70 seconds to cook (sometimes even up to 1 minute and 30 seconds if you have a small microwave). The first time you make the mug cake, pull it out at 5 seconds and see how cooked it is. Then continue to cook it in 5 second intervals, checking each time for the desired level of done-ness. This is the biggest, most important step to obtaining mug cake nirvana. The nice thing is, you only have to do this once. If you determine that 53 seconds is the optimal time in your microwave, that’s your cooking time the next time you make the cake.

Do I need to grease the mug?

Nope! When you cook it in the microwave, the mug cake pulls away super easily. It’s always nice to have an easy cleanup.

However, if you decide to make the mug cake in the oven, you will absolutely need to grease the container. If not, the cake will stick onto the sides like super glue on gum. The best way to do this is to simply swirl the melted butter around the mug/ramekin with a silicone brush, making sure to cover every dry spot. Trust me, this is required.

Can I replace the almond flour with coconut flour?

Yes and no. This recipe focuses on using almond flour. Due to how coconut flour behaves (it soaks up a ton of moisture), if you simply did a 1:1 replacement, or even a 1:2 replacement, the cake would come out super dry. I’ll be working on a replacement strategy here in the near future so stay tuned and make sure to sign up for the newsletter!

What mug should I use?

Most mugs are microwave safe, but I’m not a materials scientist. If you want to be sure, check the bottom for labeling along the lines of “Microwave safe.”

If you’re still intent on making it in the oven, despite my slyly hidden hints to not partake on this endeavor, CHECK YO MUG. A lot of mugs are painted on afterwards or possibly made from materials that cannot sustain direct heat. In this case, you must absolutely be positive that your mug is oven safe. If not, you’re basically putting a shrapnel grenade into a hot oven and hoping it doesn’t detonate.

You also don’t NEED to use a mug. This keto mug cake works extremely well (better actually) when cooked in a ramekin. The wide base allows it to grow up, but not so high that it spills over. Which leads me to my next point…


When cooked in the microwave the keto mug cake will expand- a lot. It will mimic a souffle, rising above the mug like Frankenstein looking for a snack. It always seems that it’s about to spill over the edge just as the microwave timer stops and it deflates like a sad balloon. Just keep an eye on it and marvel at it’s growth.

Meal Prepping the Keto Mug Cake

Yes, you can meal prep this mug cake. Simply mix all the dry ingredients in a container and scoop it out into the wet ingredients when the craving hits. I like to store a large batch in a plastic pint container. When prepping it, I will multiply the ingredient quantities by 5-10 and label the date that I made the batch. Works great for:

  1. Late night cravings
  2. Middle day cravings
  3. Any cravings at all
  4. Going to non-low carb dinners where people don’t want you to feel left out come dessert time
  5. An avoidance technique to keep you from eating things you don’t want to. E.g. if there’s real cake in the fridge – this cake will keep your shakes away and help you not crave the real thing.

What to pair with?

If you want to pair this mug cake with another delectable dessert and blow your calories in a single sitting, I recommend a Keto Chocolate Milkshake or even a Keto Strawberry Milkshake.

Chocolate Keto Mug Cake - Black Tie Kitchen

Chocolate Keto Mug Cake

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

This craving killer of a keto mug cake is sure to hit the spot. Whether you use the oven or the microwave, it is simple, delicious, and easily prepable.



  1. Place the butter into a mug and melt in the microwave. If the butter is room temperature, it should take ~10 seconds. If it was in the fridge, it should take ~30 seconds.
  2. If you're confident in your egg cracking abilities, crack the egg into the mug. Otherwise, use a separate vessel in case you get some egg shell in the egg.
  3. Add the vanilla extract and salt. Mix with a fork or a tiny whisk until well combined.
  4. Now its time to add the dry ingredients! Add the almond flour, erythitrol, cacao powder, baking powder, and instant coffee to the mug. Mix until well combined.
  5. Add the chocolate chips to the mug. The recipe calls for 1 tbsp, but you can also eyeball it to your liking!
  6. Place in microwave and heat for anywhere between 50 seconds and 1minute 10seconds. This will depend on your microwave, so you must keep an eye on the cake. It WILL puff up a great deal, but you do NOT want it to overcook as it will have the consistency of a sponge. It is better to pull it early, try it, and add more time if needed. You may have to do this while figuring our the proper settings on your microwave.
  7. Remove from the microwave and let cool for a minute or so unless you
    want guava lava hot chocolate in your mouth, burning a fiery path down
    your esophagus.
  8. You can top with whipped cream, flaky sea salt, or low carb ice
  9. Enjoy!


TIP 1: Meal prep the dry ingredients and keep in an airtight container.
You can take this with you anywhere and have it on hand in case a sweet
tooth craving hits.

TIP 2: This recipe is doable in the oven. Simply add ½ tsp of
unsweetened almond milk and bake at 325°F for 25 minutes.

TIP 3: If you really like chocolate, add 1 tbsp of dark chocolate chips and 1 tbsp of semi-sweet backing chips

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Nutrition Information
Yield 1 Serving Size 1 mug cake
Amount Per Serving Calories 298Total Fat 26gCarbohydrates 7gNet Carbohydrates 2gFiber 4gSugar 1gProtein 12g

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Chocolate Keto Mug Cake - Black Tie Kitchen

This Post Has 4 Comments

  1. Steffi

    Great recipe! I added a bit of peanut butter as a topping, was delicious!
    I recently found your youtube channel and I can’t believe you don’t have more subs.
    Your recipes are awesome and the quality of your videos is much higher than most keto cooking channels.

    1. Dennis

      thanks! The mug cake is a great canvas for making all sorts of decadent desserts. The part about it being prep friendly is what makes it next level!

  2. Gabe

    Made this tonight and it is the best mug cake I’ve had! I didn’t have regular cocoa powder, but had some dark cocoa powder, added some whipped topping and it was the bomb. I had to make another because everyone else was eating mine!

    1. Dennis

      haha that’s awesome! the great thing is that you can make a big batch of the dry ingredients and just keep it on hand!

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