While I was working on the Chocolate Chip Cookie in a Cup recipe, I knew I wanted to make a peanut butter version. So here it is, fresh from the microwave, a Peanut Butter Cookie in a Cup.
Start with one tablespoon of butter and one tablespoon of peanut butter. I used creamy, but chunky works too!
Heat together in the microwave for about 30 seconds to melt butter and soften peanut butter.
Add one tablespoon of packed dark brown sugar, one tablespoon of white granulated sugar, a tiny pinch of Kosher salt, and a splash of vanilla. Stir together.
Add one egg yolk. Discard egg white, or save for another use, do no add egg white or the cookie will be puffy and cake like.
Stir in egg yolk.
Add three level tablespoons of all-purpose flour.
Stir to combine.
This step is optional, but makes for yummy crunch texture! Use a measuring cup, or large spoon and a plastic storage bag to crush up a few peanuts.
Sprinkle peanuts on top of cookie dough.
Microwave cookie dough for about 45 seconds, depending on the strength of your microwave. Start checking for doneness at 35 seconds to be safe.
Enjoy the peanut buttery goodness with a glass of milk, or a scoop of vanilla ice cream!
Peanut Butter Cookie in a Cup
created by Melissa at No. 2 Pencil
1 Tablespoon of Butter
1 Tablespoon of Peanut Butter
1 Tablespoon of firmly packed Dark Brown Sugar
1 Tablespoon of Granulated White Sugar
2-3 drops of Pure Vanilla Extract {a splash}
Small pinch of Kosher Salt
1 egg yolk
3 level Tablespoons of All-Purpose Flour
Crushed Peanuts for topping
Melt peanut butter and butter together in microwave for about 30 seconds. Add sugars, salt and vanilla and stir to combine. Add egg yolk and stir again. Add flour and give a final stir. Sprinkle peanuts on top and heat in microwave for around 45 seconds. Microwaves vary, so start checking for doneness at 35 seconds. Serve warm!
If you like this recipe, try my Sugar Cookie in a Cup and Chocolate Chip Cookie in a Cup.
I’d love for you to keep up on my new posts and recipes by clicking on these cute buttons below, or follow me on Facebook and Twitter. You can also find me on Pinterest, that’s my favorite place to hang out and I’d love to see you there!
Thanks for reading!
Melissa
5 Easy Dinner Ideas for Busy Weeknights
My five FAVORITE recipes for busy families!
- Quick to make
- Light on your budget
- Easy to clean-up
- and...most important...absolutely DELICIOUS
Thereasa Gargano
March 11, 2012 at 2:43 pmThis is so cool! I just happen to love peanut butter cookies too., thanks YUM
Jo and Sue
March 15, 2012 at 11:45 pmWanted to let you know we blogged about this delicious cookie too! Thank you for sharing these. http://joandsue.blogspot.com/2012/03/5-minute-peanut-butter-cookie.html
Love your blog 🙂
SillySammi
March 27, 2012 at 9:59 pmSo yummy! Thank you so much! 😀
city
April 5, 2012 at 3:27 amnice idea.. thanks for sharing...
jomomma
April 15, 2012 at 9:26 pmMmmmm, I think I like this better than the chocolate chip version.
Belynda
April 16, 2012 at 10:02 pmI was inspired by your blog so I tried Oatmeal cookie
1 Tablespoon of Butter
1 Tablespoon of firmly packed Dark Brown Sugar
1 Tablespoon of Granulated White Sugar
2-3 drops of Pure Vanilla Extract {a splash}
Small pinch of Kosher Salt
1 egg yolk
1 tsp of cinnamon
2 tbs of instant oats
1 1/2 tbs of flour
It may need some tweaking, but was yummy. Thanks for the great idea
Melissa
April 19, 2012 at 4:22 amSounds delicious Belynda! :0)
Melia Nichols
July 21, 2012 at 8:08 pmThis sounds good! I will try it next. I have already tried the Peanut Butter Cookie and the Chocolate Chip Cookie. Yummy!
Melia Nichols
July 23, 2012 at 12:03 amDo you mean instant oats as in the kind in the little packets that you microwave or Quick Cook oats that take about a minute to cook in boiling water on the stove?
city
May 28, 2012 at 7:47 amnice idea.. thanks for sharing.
Melia Nichols
July 21, 2012 at 8:06 pmI just tried this and it was very good. Could have used a little more peanut butter flavor (I LOVE peanut butter!) I substituted Splenda for Baking and Splenda Brown Sugar Blend for the sugars and it still turned out yummy!
Andy Budziszek
August 19, 2012 at 3:22 amThis is so much better than the chocolate chip. The less time you keep them in the better!
Anonymous
August 30, 2012 at 11:37 pmmmm yum ! just had this with greek yoghurt on top 😀
Amy Roche
September 2, 2012 at 11:48 pmi tried this and it was good. the texture was between a cake and a cookie. It took a bit longer in the microwave, maybe cuz I made two at once. Is there a recommended mug size for best results?
Nikki
September 11, 2012 at 8:33 pmI was looking on Pinterest for recipes for Pina Colada cupcakes. I instead found your recipe for Peanut Butter Cup-cookies (long story). I am in no way disappointed!
I had to microwave a bit longer than suggested, and then flipped it out onto a plate since the bottom didn’t quite cook and the top was drying, but the flavour….wow!! I’ve been craving peanut butter cookies for weeks and this has totally hit the spot! I also made your Sugar Cookie in a cup the other night and it was definitely a winner ^_^ So definitely going to be sharing these!
Arun Raj
October 21, 2012 at 1:12 pmWell not sure what happened! I tried it twice and on both occasions it became hard the moment I stirred in the egg yolk. Please help me
Melissa @ No. 2 Pencil
October 21, 2012 at 2:36 pmAre you using real butter? Spread and butter substitutes won’t work and they make the dough thick and gummy. Let me know! You can email me directly at melissa.pencil@gmail.com too!
Arun Raj
October 24, 2012 at 2:13 pmHello Melissa,
Just wondering if you have received my email..cheers
city
November 7, 2012 at 2:17 amthanks for sharing.
Sarah Evelyn
November 27, 2012 at 9:31 pmYummm!! i’m eating mine right now! it is absolutely delicious! i have tried all the cookies in the mug things aand i love them! thanks so much for your awesome ideas!
cheryl brisson
January 27, 2013 at 7:42 pmOh My!!!!! I am sending this to every woman I know! ♥
Anonymous
April 17, 2013 at 12:31 amCan i use margarine as a substitute to the butter?
ND
July 2, 2015 at 6:01 pmI used Crisco, if tastes kinda grainy, but otherwise its fine.
Eman
May 11, 2013 at 8:56 amHey, can the brown sugar be substituted with honey? If yes, by how much?
Also, how can I measure out a tablespoon of butter exactly? Yours are such perfect blocks.
Thank you so muuch for these recipes! They’ll make my life so much more easier. :))
Melissa
May 19, 2013 at 6:30 amI haven’t tried honey, but let us know if you do!
I buy sticks of butter and just slice off a tablespoon amount, it’s marked on the outside of the butter wrapper. Thanks for checking in!
Ugla
May 17, 2013 at 8:43 pmUnfortunately mine didn’t turn out well, it was very dry except for the bottom which didn’t really cook! I guess I just need a different mug or something!
Heather
May 26, 2013 at 10:02 pmMine didn’t fare so well. It was extremely dry! I think my microwave may be the culprit though. The heating element is starting to wear down and sparks when I microwave anything, so I had to zap in 10 second increments. Will try again though!
Jimena
July 28, 2013 at 7:51 pmHi! Thanks for sharing this recipe. I tried it and because I love peanut butter and banana I didn’t use the tablespoon of white sugar and instead put 1/8 of a banana cut into little pieces in there at the end before microwaving. It was awesome!
kt
August 25, 2013 at 6:42 pmYum. I think this is my favorite of all your “in a cup” recipes. Also, for folks who like peanut butter and chocolate together, I tried throwing some chocolate chips into this one and it worked REALLY well.
One thing I’ve been wondering… do you need a whole egg yoke for these? Since a full batch of cookies would probably have less egg per individual cookie, I’ve been wondering if you might be able to split the yoke and use each half to make cookies in a mug for two.
Melissa
September 8, 2013 at 6:14 pmYou could definitely try it. The egg yolk was what found to work after much trail and error:0)
Hannah
August 27, 2013 at 4:14 pmMmm the texture turned out well but could have been a bit more peanut buttery! Will add a little more peanut butter next time! Thanks for this recipe! I definitely like it better than the chocolate chip recipe.
Hannah
September 8, 2013 at 7:46 pmSo good but could use more peanut butter
Hope
September 28, 2013 at 10:31 pmAdded some oats and put it in a the bottom of a flat bowl I had, added some ice cream on top, and it was delicious!
Cwhitsett
November 4, 2013 at 1:31 pmoh my. Oh, My! OH MY!!! THIS is just fabulous!!!! Did I mention it’s delicious? Can a food recipe get more than five stars, because this is definitely deserving! Came out of my microwave PERFECT! OH. MY!!!
Mag
November 16, 2013 at 12:08 pmAs I sit here scooping every last little bit out of the mug, I think i can safely say that this was a success! I combined this with your chocolate chip recipe by adding 2 tablespoons of mini chocolate chips to the
batter at the end..mmmmmm. 🙂 I just love the combination of peanut butter and chocolate together!
Cooking Notes: I used Earth Balance instead of butter and it still worked out well. However, I think I over mixed and over cooked it a bit, so I will have to fix that next time. It was still amazing though, thanks for the recipe!!
Kayla
November 20, 2013 at 4:06 pmDelish! I added a snack size pack of reese pieces too mine! Gives it that extra peanut butter taste! It definitely put it over the top! Thanks for sharing this wonderful recipe! 🙂
Fern S.
December 8, 2013 at 4:52 pmWe’re out of brown sugar at the moment, so used regular sugar in place and it doesn’t taste right. But I’m sure with brown sugar in the right place though these would be awesome. ^_^
Sammy
December 10, 2013 at 9:26 amI really enjoyed this recipe….it was simple and easy to makee…
Jessica
May 1, 2014 at 7:49 pmI substituted a 1/4 cup applesauce for the egg, and the cookie was quite tasty! I did have to microwave it for a lot longer (may be due to our old microwave). It didn’t seem like it was going to cook all the way, but it eventually started to. The butter knife wasn’t completely clean, but I was too impatient to wait :D. It had a little bit of an apple flavor. I didn’t mind though, as it lent a nice sweetness to the cookie. Thanks for the awesome recipe!
Catikas
July 13, 2014 at 1:44 pmI love this recipe! My 3 year old and I just enjoyed the best peanutbutter cookie in a cup ever. Thanks for posting this!
Kendra
August 9, 2014 at 11:10 amI just tried this recipe and was really looking forward to it after reading all the good reviews. However, after 1:20 of microwaving the cookie, it was still gooey after the first 45 seconds, the cookie is extremely crumbly. It looked like the crumbled up cake toppings that some people put on top of cupcakes. I’ve checked and re-checked the recipe and I am pretty sure I followed everything exactly…do you have any idea what went wrong? I did use light brown sugar instead of dark brown; could that be it?
Melissa
August 13, 2014 at 5:39 pmI think you should try taking it out and letting it rest after 45 seconds. The heat from the cup will continue to cook the cookie. Good luck!
Beth Henry
May 8, 2015 at 11:42 amThis happened to me too! I just ate spoonfuls of crumbles (although very tasty crumbles). I used the ingredients as listed. I wonder what went wrong? Maybe because it was all natural peanut butter (no added oils)?
Melissa
May 20, 2015 at 1:14 pmI love natural peanut butter, but I don’t recommend it for this recipe.
Rachel Page
May 23, 2015 at 1:17 amOh my, those look amazing. ! I could totally eat this for breakfast
Courtney
July 29, 2015 at 7:01 pmJust tried this recipe–it was easy and delicious! Will definitely make again! Thanks!!
Julie
November 12, 2015 at 6:54 amCooked it too long, so it was crumbly like others had commented, but this was a first time deal! Tasted good, so I mixed the crumbs up with vanilla Greek yogurt, yum!! I will make this again, solves my craving for a cookie without having to make 2 dozen that would have shamefully eaten in a day.
Andi
November 11, 2017 at 4:50 pmThis was super good! I added a scoop of peanut butter on the top ( I❤️ peanut butter!) And it softened on top, it was amazing!!! Thx