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Keto Peanut Butter Mug Cake ready in 60 Seconds!

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4.84 from 313 votes
By Carine - - 16 Comments

Keto Peanut Butter Mug Cake is an easy 60-second almond flour mug cake recipe with a delicious bakery-style muffin texture. Plus, it’s gluten-free and dairy-free!

If you follow me on my Instagram, you might know that I like simple keto recipes. And what’s more simple than a recipe done in a microwave! So be ready for keto mug cake recipes starting with this delicious low-carb peanut butter mug cake.

Is peanut butter keto?

All-natural peanut butter made with no added sugar is low-carb and keto-friendly. The main thing when you buy peanut butter on a keto diet is to look at the ingredient list. In fact, many peanut butter brands include added sugar or added vegetable oils that are not keto.

The best peanut butter to buy should include only one ingredient, peanuts. And perhaps a pinch of salt, but that’s it!

How many carbs are there in peanut butter?

One tablespoon of peanut butter made with 100% peanuts contains 2.5g of net carbs. Depending on your keto daily macros, it may look high, but it’s better to have your carbs from keto-friendly food rather than indulging in one huge amount of non-keto food.

That’s why one tablespoon of peanut butter won’t take you out of ketosis while that bakery muffin will! This being said, this keto peanut butter mug cake is your safe option to indulge and stay on track.

KETO PEANUT BUTTER MUG CAKE with almond flour, unsweetened hipped cream and peanut butter drizzle #keto #mugcake #locarb #glutenfree #ketorecipes #sugarfree

Keto peanut butter mug cake for two!

This is a recipe for two that you can share or meal prep for your next day’s snack or breakfast. Keep reading for meal prep and storage but first, let’s see the ingredients you need to make this simple almond flour mug cake with peanut butter.

  • Peanut butter – no added sugar, no added salt.
  • Coconut oil – I used unrefined coconut oil, which has a slight coconut flavor. Otherwise, use refined coconut flour or butter.
  • Egg – don’t replace by flax egg, I tried, and it doesn’t come out great at all.
  • Almond flour – thin, blanched, or almond meal, but the mug cake will come out slightly drier.
  • Baking powder – or half the amount of baking soda if preferred.
  • Sugar-free crystal sweetener – as always, I am using Monk fruit stevia blend, but erythritol or xylitol will work well too. Read my review of keto-friendly sweeteners to learn some more!
  • Unsweetened vanilla almond milk – or unsweetened almond milk or unsweetened coconut milk.

How to store mug cakes?

This recipe makes two mug cakes, and you may want to serve the second mug cake later. If so, I recommend storing half of the uncooked batter in a ramekin. Film the ramekin with plastic wrap, store it in the fridge.

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The next day, remove the plastic wrap and microwave straight out from the fridge. You may have to microwave for slightly longer. An extra 20 seconds may be needed to achieve the same texture as the batter is very cold.

Another option is to bake both servings at 180C (350F) on fan-forced mode for 10-12 minutes. The baked mug cake will store at room temperature for up to 3 days.

How to serve my mug cake?

Mug cakes can be dry on their own, and I always recommend a dollop of cream on top. The good thing with that extra tablespoon of cream: it doesn’t add carbs to the recipe! Your keto toppings options are:

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  • unsweetened whipped cream
  • unsweetened whipped coconut cream
  • sour cream
  • cream cheese
  • warm peanut butter – careful. This will add a few carbs to the recipe.

KETO PEANUT BUTTER MUG CAKE with almond flour, unsweetened hipped cream and peanut butter drizzle #keto #mugcake #locarb #glutenfree #ketorecipes #sugarfree

More keto mug cake recipes

If you love fixing your sweet craving quickly with mug cakes as I do, I also recommend trying:

I hope you enjoy this new easy keto recipe. If you make it share a picture with me on Instagram! 

XOXO Carine

Recipe Card

Keto Peanut Butter Mug Cake

KETO PEANUT BUTTER MUG CAKE with almond flour, unsweetened hipped cream and peanut butter drizzle #keto #mugcake #locarb #glutenfree #ketorecipes #sugarfree
6.7gNet Carbs
4.84 from 313 votes
Prep Time: 1 min
Cook Time: 1 min
Total Time: 2 mins
Net Carbs 6.7g
Fat 19.2g
Protein 8.2g
Calories 258kcal
Author: Carine Claudepierre
2 serves
Keto peanut butter mug cake is an easy keto mug cake recipe with almond flour.

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Net Carbs
4.84 from 313 votes
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  • In a small bowl, add peanut butter, coconut oil, and almond milk. Microwave for 30 seconds or until the coconut oil is soft and almost melted. Whisk to combine until all the ingredients come together into a cream.
  • Stir in the sugar-free crystal sweetener, baking powder, almond flour, and beaten egg (at room temperature), until it forms a cake batter.
  • Transfer the mug cake batter evenly into 2 ramekins or microwave-safe mugs.
  • Microwave each ramekin individually for 60 seconds.
  • Serve immediately with unsweetened whipped cream or an extra drizzle of warm peanut butter (will adds some carbs!)
Too much for your macro? Split the recipe into 3 servings to make smaller mug cakes and get only 4.5 grams of net carbs per serving!  
This is a recipe for 2 mug cakes (or 3 to decrease net carbs if needed, see the note above). I recommend keeping the extra batter in the fridge, in single microwave-proof mugs/ramekins. Wrap the ramekin with a piece of silicone (or plastic wrap to prevent the top from drying). Store up to 24 hours in the fridge. The next day, remove the plastic wrap, microwave straight out from the fridge. You may have to microwave for slightly longer. An extra 10-20 seconds may be needed to achieve the same texture as the batter is very cold. Another option is to bake both serves at 180C/350F on fan-forced for 10-12 minutes. The baked mug cake will store at room temperature for up to 3 days.
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Nutrition Facts
Keto Peanut Butter Mug Cake
Amount Per Serving (1 mug cake)
Calories 258 Calories from Fat 173
% Daily Value*
Fat 19.2g30%
Carbohydrates 8g3%
Fiber 1.3g5%
Sugar 2.1g2%
Protein 8.2g16%
Net Carbs 6.7g
* Percent Daily Values are based on a 2000 calorie diet.

KETO PEANUT BUTTER MUG CAKE in 90 seconds microwave #keto #mugcake #peanutbutter #healthy #moist #easy #healthy #microwave #lowcarb

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    16 thoughts on Keto Peanut Butter Mug Cake ready in 60 Seconds!
  1. 5 stars
    Is the net carbs and 258 calories for the whole of the two servings, or is it per 1 mug cake? If I make it, do i have to half the macros if I only have one of the servings?

  2. 5 stars
    It’s good! I tried it with coconut oil and with butter. I strongly prefer the coconut version. So moist and cake-like. I don’t add anything on top. I just don’t think it needs it.

  3. 5 stars
    I’ve tried several other keto mug cake recipes – this has the best, most cake-like texture than any other I’ve tried. I used the Lakanto brand monkfruit sweetener but found 1.5 tablespoons hurt my throat with its sweetness. Next time will either try 1 tabl of the monkfruit sweetener, or maybe 1.5 tabls of Swerve, which is less sweet. Still, it was excellent – this will be my new go-to!

    • Yes sure, make sure you are using fresh almond butter jar with oil on top or the mug cake will come out dry. Enjoy, XOXO Carine.

  4. Hi!

    I input all of the ingredients with the products I have via my carb manager app, and this comes to 12 net carbs versus the 8. Why the difference?

    • What count is net carbs total carbs takeaway fiber and usgar alcohol. Carb manage total carb shows sugr alcoho, my nutrition fact doesn’t because they don’t count in the keto equation. I am sure that if you compare net carbs, it will be the same. Enjoy, XOXO Carine

      • my net carbs come to 12net, sugar alcohols not included….

        This is what I get:

        Cal 247
        Net Carbs 12
        Fiber 2.7
        Sugar 1.7
        Protein 9.4
        Fat 21.9

        • I provide nutrition panel as an information, using the ingredients I am using in my country. It is totally possible that your peanut butter brand selected in the app has different net carbs explaining the variation. You should always calculate the net carbs using the exact brand of ingredients you use for precision. Enjoy, XOXO Carine.

  5. Hi Carina, i love your recipes so much. I was trying to make your homemade peanut butter but it seems like my food processor is not strong enough as after nearly half an hour it still didnt go smooth. Could you please tell me which food processor is the best for nut butter ? Thank you..

    • Hello! Thanks so much for trying so many of my recipes it makes me very happy ! Of course, the power of the food processor is what turns nuts into butter and you need a very strong blade nd high power. I use either a Kitchenaid pro blender here. This is my favorite so far because it has a tamper to tackle tough ingredients and turns nuts into nut butter in about 1 minute. Or I use my 11 cups kitchen aid food processor, it takes longer with this one as you need to stop and scrape bowl many times to achieve the right texture. Those tools are expensive at first but long warranty and I don’t nut butter any more so it is very nice ! I hope this is helpful, Enjoy, XOXO Carine.


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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