Mini Rainbow M&M Cookies with Peanut Butter Buttercream.

What is the only way to make a truly perfect cookie… better?  Add buttercream.  Peanut butter buttercream, to be exact.  My Rainbow M&M Cookies are now MINI (i love cute things!!) and double stuffed, over-filled, and bursting with buttery, creamy peanut butter buttercream.


I have a love for the same basic cookie dough recipe, a recipe based off of the Cooks Illustrated recipe for Chewy Chocolate Chip Cookies. I’ve used the dough recipe for several of my recent cookies because…. it’s a guarantee.  This basic recipe produces thick, chewy, unbelievably soft cookies.

The peanut butter buttercream filling is extremely decadent in today’s cookies.  Like, hand-me-a-TALL-glass-of-milk-decadent.  It’s rich and THICK.  It’s much different than the silky peanut butter frosting I used to frost my brownie cupcakes.  No, this buttercream is comparable to the thick sandwich filling in Oreos and I credit that to the smidge of heavy cream I used in my recipe.  You may use any type of milk or even half-and-half, but I had leftover heavy cream in my fridge, so I figured what-the-heck!

A buttercream’s thickness is directly related to the ratio of liquid vs sugar.

I used very little heavy cream in this buttercream and a decent amount of confectioners sugar, thus producing a stick-to-the-roof-of-my-mouth frosting.

The mini M&Ms and peanut butter buttercream filling pair wonderfully together, just as one would imagine.  Peanut Butter M&Ms are my favorite and I get the same fudgy/PB effect in today’s cookie recipe.

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Mini Rainbow M&M Cookie Sandwiches with Peanut Butter Buttercream

Buttercream filled cookie sandwiches should be stored in the refrigerator.

Yield: 30 mini cookie sandwiches

Ingredients:

Cookies

  • 2 cups + 2 Tbsp all-purpose flour
  • 1/2 tsp baking soda
  • 3/4 cup (1.5 sticks) salted butter, softened to room temp
  • 1 cup light brown sugar
  • 1/2 cup sugar
  • 1 egg + 1 egg yolk, at room temperature
  • 2 tsp vanilla extract
  • 1.5 cups mini M&Ms

Peanut Butter Buttercream

  •  6 Tbsp salted butter, softened to room temperature
  • 6 Tbsp creamy peanut butter
  • 2 tsp vanilla extract
  • 3 cups confectioners’ sugar, sifted (plus extra if needed)
  • 1 Tbsp cream or milk or half-and-half (plus extra if needed)

Directions:

  1. Preheat oven to 325 degrees.
  2. Make the cookies. Mix the flour and baking soda in a bowl and set aside. With an electric or stand mixer fitted with a paddle attachment, cream the butter and sugars together on medium speed. Add the egg, egg yolk, and vanilla and mix well. Gradually add the flour mixture and stir until a dough forms. Fold in mini M&Ms.
  3. Chill dough for AT LEAST one hour (I chilled mine for 24 hours).
  4. Drop cookie dough into small uniform sized balls (mine were about 1 tsp of dough each, which are TINY, but bake them any size you'd like) onto ungreased baking sheet or silpat. Bake for 8 minutes or until edges are slightly browned. The centers should appear soft and puffy. Let cool completely on wire rack.
  5. Make the frosting. Cream butter and peanut butter on medium-high speed with a stand mixer fitted with a paddle attachment.  Add vanilla extract and 2 cups confectioners' sugar.  Beat for 2-3 minutes, or until mixture is smooth and thick.  Scrape down the sides of the bowl if needed.  Add milk/cream/half-and-half and beat for another minute.  Add 1 more cup of confectioners' sugar and continue adding until you reached desired consistancy.  I added exactly 3 cups.  Once cookies are completely cooled, stuff cookies generously with peanut butter buttercream filling.

© Sally’s Baking Addiction. All images & content are copyright protected. Please do not use my images without prior permission. If you want to republish this recipe, please re-write the recipe in your own words, or link back to this post for the recipe.

 

Here are my original, full-sized, un-stuffed Rainbow M&M Cookies:

   

47 Responses to “Mini Rainbow M&M Cookies with Peanut Butter Buttercream.”

  1. #
    1
    Jessica@AKitchenAddictionposted June 20, 2012 at 1:27 pm

    Amazing! These are my kind of cookie!

    Reply

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    Averie @ Averie Cooksposted June 20, 2012 at 2:04 pm

    Thanks for linking up and trying my PB buttercream and yes, we share a love for super thick frosting. When I made it as well, it was really thick. I use half and half in all my baking. I don’t buy much milk but I always have half-and-half on hand (for coffee..or baking!) so that’s what I used but really, it’s all about the butter/confectioners sugar ratio as you mentioned and basically getting as much sugar into that butter as it will “hold”. The more you cram in, the thicker it’s going to be…which I love :)

    Reply

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    Choc Chip Uruposted June 20, 2012 at 3:57 pm

    There is no doubt that these amazing cookies would last one minute at my place :D

    Cheers
    Choc Chip Uru

    Reply

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    Cassieposted June 20, 2012 at 4:36 pm

    Sandwich cookies are so fun. Love these Sally!

    Reply

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    Karlyposted June 20, 2012 at 4:39 pm

    Okay, so wait. Back up a second here.

    Not only are these MINI cookies, which means that I’m required by law to eat at least 4 of them, but they are ALSO full of some of the most delicious sounding peanut butter frosting to date?

    Imma need my fat pants.

    Reply

    • Sallyreplied on June 20th, 2012 at 5:17 pm

      Hahahaha Karly your comments make me laugh uncontrollably. And yes, mini things = required to pop about 4 or 5 into your mouth. Kinda like your mini corndogs!

      Reply

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    Sarah K. @ The Pajama Chefposted June 20, 2012 at 5:48 pm

    whoa, these cookies are super intense! i wonder what they’d be like with reese’s pieces instead of the m&ms….

    Reply

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    Erin @ Dinners, Dishes, and Dessertsposted June 20, 2012 at 6:42 pm

    Yum! Anything with peanut butter and M&M’s in the same recipe is all good with me!!

    I sent you an email about helping in a bake sale I am doing – are you interested?

    Reply

    • Sallyreplied on June 20th, 2012 at 9:31 pm

      Thanks Erin! I will write you back!

      Reply

  8. #
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    Ashley @ Kitchen Meets Girlposted June 20, 2012 at 6:48 pm

    Sally, these cookies are amazing! Such gorgeous pictures, too! So, so glad I found your site! And I’m totally drooling here over that peanut butter buttercream–heaven!!

    Reply

    • Sallyreplied on June 20th, 2012 at 9:32 pm

      Ashley, thank you so much. I struggle with my photos sometimes, so that means a lot!

      Reply

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    Dorothy @ Crazy for Crustposted June 20, 2012 at 6:56 pm

    Sandwich cookies are the best because you get two cookies for the price of one! :)

    Reply

    • Sallyreplied on June 20th, 2012 at 9:32 pm

      I like your thinking Dorothy ;)

      Reply

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    Julie @ Table for Twoposted June 20, 2012 at 8:40 pm

    i love that these are mini and are stuffed with peanut butter buttercream!! i can’t think of a better way to eat these..well, a glass of milk to help me out a little but other than that, this is perfection!

    Reply

    • Sallyreplied on June 20th, 2012 at 9:31 pm

      The THICK pb buttercream filling def calls for a tall glass of milk! Thanks Julie!

      Reply

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    Laura Dembowskiposted June 20, 2012 at 9:00 pm

    Sally, These just look fabulous! I’ve never had peanut butter buttercream, and now I think I’m going to have to try it. I also slways love a good sandwich cookie; it’s such a good excuse to eat 2 cookies:)

    Reply

    • Sallyreplied on June 20th, 2012 at 9:30 pm

      Thank you Laura! PB Buttercream is a MUST try! Promise me you’ll try some soon :)

      Reply

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    12
    Michael @ BlueberryChuckleposted June 20, 2012 at 9:06 pm

    Turning these up a notch with the butter cream. For the win!

    Reply

    • Sallyreplied on June 20th, 2012 at 9:30 pm

      Haha yes! definitely kicked up a notch, buttercream makes everything better. Thanks Michael!

      Reply

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    Reeniposted June 20, 2012 at 9:51 pm

    These are INSANE! I am in total and utter love! Being a frosting girl through and through – a few of these would satisfy my cravings completely.

    Reply

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    Back For Secondsposted June 20, 2012 at 11:18 pm

    Oh Sally. I knew these would be good. Sign me up for a few (read 10)! That frosting looks dreamy!!

    Reply

    • Sallyreplied on June 21st, 2012 at 11:26 am

      The frosting is definitely DREAMY!

      Reply

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    Jocelyn @BruCrew Lifeposted June 20, 2012 at 11:33 pm

    You just keep posting better stuff every day:-) Good thing I have on stretchy pants…the other ones won’t fit after I get ahold of that frosting!!! Thick and stick to the roof of my mouth sounds just perfect!!!

    Reply

    • Sallyreplied on June 21st, 2012 at 11:27 am

      Hahahaha Jocelyn I think I’ll need my stretchy pants if I eat another one of them. Thankfully, I brought the rest into work and they disappeared!

      Reply

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    Chung-Ah | Damn Deliciousposted June 21, 2012 at 1:35 am

    How fun! I haven’t seen mini m&ms in ages!

    Reply

    • Sallyreplied on June 21st, 2012 at 11:27 am

      Thank you! I love little mini M&Ms, they are so fun to bake with.

      Reply

  17. #
    17
    Sally @ Spontaneous Hausfrauposted June 21, 2012 at 8:11 am

    Your description of that peanut butter buttercream is making me positively drool!

    Reply

    • Sallyreplied on June 21st, 2012 at 11:28 am

      haha Sally you are too funny! And yes, thinking about that buttercream (it’s all gone!) is making me positively drool too…

      Reply

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    Hayleyposted June 21, 2012 at 11:01 am

    Okay, you twisted my arm. I’ll run and go get some elastic-waistband pants now. Jeez louise, these look superfantastic. Small and rich and creamy and chewy and pretty much the stuff my dreams are made out of. Yeah, most people dream as if they’re in a rom-com, or on a beach, or beating stuff up as a ninja (if you’re my boyfriend), but I dream of this. Perfect, petite cookies stuffed with the most decadent peanut butter frosting evah. I love you.

    Reply

    • Sallyreplied on June 21st, 2012 at 11:29 am

      Hahaha I dream about buttercream Hayley… it’s all good. <3 you too miss cookie dough queen!

      Reply

  19. #
    19
    Meghan @ After the Ivy Leagueposted June 21, 2012 at 11:10 am

    Sandwich cookies…..peanut butter buttercream….I’m dying! WHY does it have to be 90 degrees in my kitchen right now? What I wouldn’t give for central air. Maybe I’ll just make this frosting and eat it with a spoon.

    Reply

    • Sallyreplied on June 21st, 2012 at 11:30 am

      Hey Meghan! It’s 104F wher eI am right now and all I want is cold buttercream haha.. is that weird? ;)

      Reply

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    Emma @ Food, Fork and Goodposted June 21, 2012 at 11:12 am

    I love how colourful your blog is! These look beautiful. Also: I love your blog! So I’ve nominated you for the versatile bloggers award. Check out the post to find out more =] http://food-fork-and-good.blogspot.co.uk/2012/06/herb-crusted-chicken-with-veggie-fries.html

    Reply

    • Sallyreplied on June 21st, 2012 at 11:30 am

      Thank you so much Emma! You are so sweet. :)

      Reply

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    Laurie {Simply Scratch}posted June 21, 2012 at 2:30 pm

    These are too cute! M&M’s are my absolute fav! Next to chocolate covered pretzels of course! :)

    Reply

    • Sallyreplied on June 21st, 2012 at 11:17 pm

      i think i ight have to combine mini m&ms AND choc covered pretzels one of these days!

      Reply

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    Michelleposted June 12, 2013 at 10:47 pm

    Why do they have to be Mini sandwich cookies, I would love a big ole sandwich cookie!! Many others do not share my DEEP appreciation for sweets…

    Reply

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    Allyposted September 26, 2013 at 10:13 am

    Hi Sally! I wanted to make just the cookies for a party, and was wondering if this recipe can be halved. Thanks!

    Reply

    • Sallyreplied on September 26th, 2013 at 1:06 pm

      Hi Ally! It’s difficult to halve this recipe with success because of the 1 egg + egg yolk. I don’t recommend it. You can always freeze the leftover cookies (without buttercream) for up to 2 months.

      Reply

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    Anna Oposted November 14, 2013 at 3:55 pm

    Hi Sally! I just made these for a Chrismukkah party tonight. Instead of rainbow M&Ms, I used red & green ones. I also added some festive Christmas sprinkles to the buttercream frosting. To die for! Thanks for sharing!

    Reply

    • Sallyreplied on November 14th, 2013 at 4:39 pm

      Love the idea of adding sprinkles to the buttercream Anna! :) Thanks for giving me that tasty little tip. I’ll try it next time.

      Reply

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    Emmaposted March 25, 2014 at 11:25 am

    Can I use chunky,PB instead of creamy?

    Reply

    • Sallyreplied on March 25th, 2014 at 11:28 am

      Definitely! But there will be chunks in the frosting then. Enjoy!

      Reply

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    Sallyposted May 27, 2014 at 7:01 am
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    Hallieposted June 15, 2014 at 7:37 pm

    Made these cookies – SO good, and a big hit!

    One question – the batch I did that was about a tablespoon’s worth of dough came out perfectly, but the tiny ones I tried were way too crispy … how long would you recommend cooking those tiny ones? Any temperature adjustment?

    Your site has become my go-to for all new baking adventures :)

    Reply

    • Sallyreplied on June 16th, 2014 at 12:34 pm

      Hey Hallie! No temperature adjustment – about 7-8 minutes in the oven. I need to be more clear in these instructions – I’ll update it!

      Reply

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    Sarah Robertsonposted September 1, 2014 at 4:13 pm

    These were excellent. I just made them for a Labor Day BBQ and it’s been hard trying to get my husband to stay out of them! They are a little different than the average cookie, pretty & fun for a party. I added these to my personal favorite recipe! I have really been enjoying making items from this blog- Thank you!

    Reply

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