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Chocolate Peanut Butter Cake in a Mug

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This is the kind of recipe that will make you want to leave your boyfriend if you have one.

A "single-serving" chocolate cake that can be made in your microwave, tastes like a Reeses peanut butter cup, and is under 150 calories for the entire recipe:

Or at least lock him outside for an hour. A girl needs her space when chocolate and peanut butter are involved.

No boys allowed.

1 Minute Chocolate Peanut Butter Cake

Above, topped with Healthy Coffee Fudge Frosting.

Peanut Butter Cake in a Mug

Chocolate Peanut Butter Mug Cake


Adapted from One-Minute Chocolate Mug Cake.

    • 1 tablespoon plus 2 tsp cocoa powder (8g)
    • 3 tablespoons powdered peanut butter (PB2 or Betty Lou’s) (For substitutions, see “nutrition facts” link below) (18g)
    • scant 1/16 tsp salt
    • 1 tsp sugar or xylitol (omit if you like bitter chocolate cake) (4g)
    • 1/4 tsp baking powder
    • pinch stevia OR 1 additional tablespoon sugar
    • 2 tsp coconut or veg oil, or mashed banana or applesauce (I personally don’t like the fat-free option and recommend the oil, but I’m adding the option because I know many of you don’t mind the taste/texture of the lower-fat version.) (8g)
    • 3 tablespoons milk of choice (45g)
    • 1/4 tsp pure vanilla extract

Mug Cake Recipe: Combine dry ingredients and mix very, very well. Add liquid, stir, then transfer to a little dish, 1-cup ramekin, or even a coffee mug. If using the microwave: cook 1 minute 25 seconds (time may vary, depending on your microwave’s wattage). If you don’t want to eat it straight out of the dish, be sure to spray your dish first (and then wait for the cake to cool before trying to remove it). You can cook this in an oven if you prefer, but you’ll have to experiment to find the correct amount of time.

View Mug Cake Nutrition Facts

1 Minute Chocolate Peanut Butter Cake

Peanut Butter Cake

Were you friends with boys growing up? Or did you think boys had cooties?

When I was really little, I was friends with all the boys. They had better toys! Swords and transformers and legos beat playing House any day. I never even heard the idea boys had cooties until third grade, and by then I already knew that wasn’t true.


mothers day food

Flourless Chocolate Chip Cookies

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Katie is the baker, photographer, and author of the popular blog Chocolate-Covered Katie. Her favorite food is chocolate, and she believes in eating a balanced diet that includes dessert every single day. More about Katie—> 
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  1. It’s so funny. I was friends with tons of boys growing up when I didn’t really care what they thought of me! Now, not so much… Haha. I should probably try and change that 🙂

  2. Emily says:

    I always had more guy friends than girl. They were just more fun to be around with; so carefree and just relaxed (well, relaxed in a sense of personality, not motives – you try and tell a hyperactive little boy to relax haha). That stayed true through middle school and even now in high school. Girls are too, well I won’t say that word that comes to my mind since it isn’t really PG. x)

    The cake is cute. Just curious, what are those lighter brown spots? The cake looks too small to have peanuts in it, and I know it obviously isn’t corn. ..Am I the only one who thinks it looks a bit like corn? ..No? Maybe I’ve got it on my mind since fresh corn off the cob season is coming to a very quick end LOL. Anyway, is that coloring just from the powdered peanut butter? I’ve never used/seen it before so that might be it. Thanks!

    1. I think it’s just the part of the peanut flour that didn’t get mixed up completely with the cocoa powder.

  3. I had a couple friends who were boys growing up. I remember a picture from my first grade birthday party – I had ONE boy there. Poor guy. 🙂 Since I grew up with 3 brothers and no sisters, I got used to having rough-and-tumble boys around. In fact, I often remember playing Barbies and Legos with my brothers. I’d build large chairs and tables for Barbie while they built ships and intricate buildings.

  4. Rosalie says:

    For any fellow Canadians: I like to order peanut flour (Protein Plus peanut flour = the old Trader Joe’s stuff; they do sell PB2, though) off of because they do a flat rate 8$ shipping–some American sites have the actual peanut flour or PB2 for cheaper but shipping ends up, like, 26$ 🙁

    Pertinent to the recipe itself: this looks delicious! Your photography has improved SO much in the past few years, Katie 🙂

    1. Jill says:

      In response to Rosalie, I just found this:

      1. tiffany says:

        I found that site after i looked at amazon… has a combo pack of regular pb2 and the chocolate kind for like 10 bucks, but on it’s about 50-60 which makes no sense at all to me since they’re the same size containers.

  5. Leslie says:

    You have NO idea how excited I am to see this recipe! Your chocolate cake in a mug is my stand-by dessert and as a peanut butter lover I can only imagine loving this one even more. And the best part is that I have all the ingredients. Would it be too early to make one of these babies right now? 😉

  6. Andie says:

    Yay! More single-serving recipes 😀 This looks great. As soon as I get home from vacation I’m making this! (My meat-eating family likes their desserts with eggs and milk…sigh.) As for the question of the day, I was friends with boys growing up, but I just moved to a new high school…so I don’t know too many people at the moment….:/

  7. Sarahishealthy says:

    You have the BEST blog!!!
    So excited for this recipe, and for your cookbook!

  8. This looks great. I really need to start making some of these recipes!

  9. Pinned! I make your 1 Minute Chocolate Cake on a weekly basis, it is so good! Thank you for finally doing something with pb2! So excited to try this!

  10. Lisa C. says:

    The food, the photos, the recipe… it all just looks so good! I check your blog every morning and it always makes me smile. 🙂

    I think I remember giving all my friends cootie shots when we were little. Boys were strange creatures to us! Oh fun times ;).

  11. I totally aree that all girls need lone time with peanut butter and chocolate. While growing up, I had alot of guy friends and it never occurred to me about cooties..and still today I think guy friends are much cooler..

  12. I thought boys were dumb all the way through college. Then I met a few spectacular guys that changed my opinion, & then of course met my husband who I think is the greatest man on earth. I still think most guys are “guys,” but I do appreciate their generally more laid back approach to life. (& now I have two boys of my own–I love them!).

  13. Brandy says:

    I get my Peanut Flour from It’s really not that expensive and if you spend $20 or more you get free shipping.

  14. Perfect timing! I just started making microwave peanut butter cookies and I’m totally addicted. Was looking for new recipes to try!!

  15. Kristin says:

    I can’t wait to get this, but I’d like to add the icing too! Is there a link to that?

    1. Emma says:

      It’s linked in the post.

      1. Kristin says:

        doh!! Thanks 🙂

  16. Erika says:

    I just tried this with almond flour….major miss. Turned into a pile of mush. So I made a single lady cupcake instead!

    1. Karen says:

      Me too… I’m trying it today with almond flour because that’s what I had on hand. I’ve put it back into the microwave a few times, but it keeps coming out with a layer of liquid on the top and it’s not getting done. (sigh)

      1. Karen says:

        Feel free to delete my post here (I don’t see a way for me to do so). I will have to try this out again sometime. I just realized that I used TBS instead of tsp with the coconut oil. I can’t give an honest answer if this would work with almond flour or not. OOPS!

        1. Monica says:

          Ha ha, I did the exact same thing. Major chocolate craving kept me from reading the recipe right. I just added a few more tablespoons of almond flour. It did not set up like the picture, but still tasted yummy!

  17. Sydney says:

    Can’t wait to try this! Although I should probably wait to work off my turkey from us in Canada’s thanks giving yesterday!

  18. Laura M says:

    I always love the chocolate-pb combo. Definitely one of my favorite flavors of all time. Keep up the good work! And I was always friends with the boys too, because they always wanted to run around outside like I did!

  19. Sophie says:

    Do you think I could make this with a hit of normal pb if I don’t have any pb flour? And maybe just add normal flour to give it a similar consistency? I really want it now 🙂

    1. I *think* you could make the original recipe (linked in the post where it says “inspired by this recipe”) and add some pb to it…

    2. Alanna says:

      I would guess you might have luck subbing regular flour for the PB2 and subbing peanut butter for some (or all?) of the oil… seems like the PB stands in for oil when doing the choc PB boatmeal. If you figure it out, let us know — I’d definitely be interested to try it!

      1. Kristin says:

        This is what I did just now because I had to have this as a snack and had never heard of PB Flour before this post!

        I used “regular” unbleached flour, took out the oil and subbed in 2 tsp crunchy natural peanut butter. worked like a charm. The crunchy peanut butter has the added bonus of adding texture! (Probably not as “healthy” though…heh)

        1. Alanna says:

          Yummy — thanks for letting us know, Kristin!

        2. HealthFoodJunky says:

          That is so helpful!

  20. Emma says:

    Katie, I just made this and then I had to run to my computer to tell you how AWESOME it was!!! Seriously even better than the regular flour version.

    I am in love with this cake! 🙂 🙂 🙂

    People, RUN to your kitchens and make this. You won’t be sorry!

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