Peanut Butter Rainbow Marshmallow Squares
I have a confession to make: these.
Those peanut butter-butterscotch chip-rainbow mini marshmallow lovelies that remind me of parties at my great Aunt’s house, when she put out plates of dainties that included these and Nanaimo bars – the ones I’d swipe the quickest. I still do. I used Easter as an excuse to make them – everyone needs some pastel colours in their weekend, right? – because I still haven’t managed to reconcile the fact that I’m a grownup and I can make a batch of peanut butter marshmallow squares anytime I want and eat the whole thing myself in front of the TV.
It gets worse: I love them frozen. Like so many desserts of their ilk, I have in the past attempted to hide them from myself in the freezer, falsely thinking that their frozen state would deter me from eating them until they’re gone. (This doesn’t work with brownies, either.) Frozen, the marshmallows take on a chewy texture, the butter and peanut butter keeping their delicious carbonite enclosure from freezing solid, so that they’re extra firm, yet easy on the teeth. Part of me wants to make a batch with dark chocolate, but it seems like blasphemy.
Some people put coconut in theirs, and you see the odd version with walnuts. I like straight-up marshmallows, but the addition of coconut is acceptable – especially when you have large curls of it in your baking cupboard. Make sure you wait for the peanut butter goo to cool down a little before you stir in the marshmallows – and whatever you do, don’t stand around taking pictures of them slightly submerged, or you’ll wind up with swirls of melted marshmallow, which isn’t entirely bad. (If you like, pop the marshmallows in the freezer for a bit to prevent them from melting.)
Peanut Butter Rainbow Marshmallow Squares

In a medium saucepan, melt the butter, peanut butter and butterscotch chips over medium-high heat. Remove from the heat and set aside to cool slightly so that you don't melt the marshmallows. Stir in the marshmallows and coconut and spread into an 8x8-inch pan, lined with parchment if you life. Refrigerate until firm and cut into squares.
Ingredients
Directions
In a medium saucepan, melt the butter, peanut butter and butterscotch chips over medium-high heat. Remove from the heat and set aside to cool slightly so that you don't melt the marshmallows. Stir in the marshmallows and coconut and spread into an 8x8-inch pan, lined with parchment if you life. Refrigerate until firm and cut into squares.
These are my favourite childhood food memory. My granny would make them and my diabetic gramps would scarf them down in one bite. And no, keeping them in the freezer is no deterrent. Infact, in my house, it just makes it easier for my daughter to sneak them, as the freezer is in the basement.
Holy smoke these look delicious! These would not last long at any party I can tell you 😀 Thank you so much for sharing the recipe Julie! x
Nanaimo Bars are also meant to be eaten out of the freezer….
I substituted Chipits sea salt caramel chips. About 2/3 bag so not quite so sweet
…as are homemade cake doughnuts and whipped shortbread!
Also my all time faves. Also forget that I could make them whenever. Also only ever eat them frozen. It’s the only way.
I first had these at a baby shower my Mom took me to when I was a kid and it was love at first bite! I love them out of the fridge all cool and fudge like. I can’t get around adding coconut or walnuts but I have used 1/2 crunchy peanut butter.
Love the idea of using crunchy peanut butter Jackie!
This is literally the only way that I like to eat marshmallows! (I also have a thing for frozen desserts that aren’t necessarily intended to be frozen).
My mom always makes these with butterscotch chips. I always make them with chocolate chips and white marshmallows. THere was the year that my mom used very stale (crunchy) marshmallows in them … not a good idea. For our house, it wouldn’t be Christmas without these. Fantastic memories!
My Grandma always brought these to pot lucks in very small town Sask. I made them for my peanut allergic husband for the first time with WOW butter and they worked out fine(although I admit I haven’t had them in their original form in forever)
Hi Julie,
I have not seen any butterscotch chips this side.
Do you think toffees would be a substitute?
Toffee has a different consistency Gertrude… maybe chocolate chips or peanut butter chips?
Oh boy – talk about a trip to “memoryville”. I’ll be making a batch of these for the freezer pdq. Thanks Julie.
FYI These are just as good (and I like them better) made with pea butter for all those school events!
Yes Diane – good point! I’ve made them with golden pea butter before and they’re fab!and look just the same! although teachers tend to mistrust them when they look too much like real peanut butter!
These are so cute! Totally love. 🙂
I absolutely love these… but they are so addictive!! A pan of them doesn’t last long in our house!! Might have to try with coconut… never tried that before…
Just made these with Almond Butter. My kids had never had these before. I almost (only almost) preferred them over the peanut butter ones. They didn’t last long.
I also prefer eating them frozen. So much better. I also took to adding some Rice Krispies to add a light crunch to them. So delicious!
My mixture is not silky-smooth…it’s granular (with unmelted chips I guess). I was using a double-boiler then switched to microwave but no luck. What am I doing wrong? Thanks!
Nicole use crunchy peanut butter… Skippy is the best
Lots of crunch much better than smooth peanut butter
I have never been able to get these to work either! Butterscotch chips won’t melt!!!
I use a teflon saucepan on med to low heat to melt the chips instead of using a double-boiler and that works well. Some of my friends remembered this recipe with Rice Krispies added, I haven’t tried that yet.
Dana …. I always use a full cup of butter.Try that it might help.
Am I the only one who finds these headache-inducingly too sweet?
Maybe try making with natural peanut butter…that would cut down on overall sweetness?
It would for sure! But they’d definitely have a different texture.
This is a favorite of mine as a kid. I have recently started making them for a great group of wrestlers when they come to town and will be doing that this weekend. Missed doing it one show and they all come into the house check the fridge and say hey grandma you got any of them peanut butter squares…….. mom said sorry guys she was to busy this time………. so they be here Tuesday night and they will have their treats. Road trip 16 days 16 cities/towns 4 provinces 🙂
That is the best peanut butter marshmallow square story ever!
I made them with half white chocolate chips and added some rice krispies they didn’t turn out to bad all my friends loved them .
Just made pans of these to add to baking packages I give out as gifts. As always with your recipes, Julie, they turned out perfect! You rock, woman! I no longer search the web for whatever recipe I think will turn out best – yours are always reliable and delicious.
Yaaaay!! So glad to hear it! You made my day! 🙂
Aww I love these they are so good
I love these I usually just buy one square while grocery shopping. They are on the salad bar and ring up as salad on my receipt.
Ha! Awesome.
Look delicious
A Christmas/Easter tradition in my house. The mini marshmallows now includes more white than coloured ones. ? I use a double boiler & then pop the top pan into a cold water bath to cool it when mixing in the ‘mallows.
Awesome!
There are two bright spots for anyone considering homemade renewable energy
systems. If you’ve always wondered what the power companies, the green builders, and other so-called green thinkers aren’t suggesting wouldn’t that
be worth a couple of minutes of your time to get out.
* Dimethylaminoethanol DMAE is related to choline which is a biochemical precursor on the neurotransmitter acetylcholine.
Hi Julie,
I just whipped up a batch for my Christmas cookie trays that I give to friends and family. These were always on the candy trays my grandma set out for Christmas. The one time of year mom wasn’t really paying attention to how many goodies we ate! Great memories.
I was just saying that same thing to someone last night!
You are right, they cannot resist, I am ashamed to admit that I ate the whole portion for this Easter, I had to cook additionally! Unforgettable taste of childhood!
I’m the same way!!
Robyn Rilet, I have made these many times using natural peanut butter – no sugar, no salt added and they work perfectly. Enjoy!