Peanut Butter Marshmallow Squares – Confetti Squares
These Peanut Butter Marshmallow Squares – AKA Confetti Squares are one of my favourite nostalgic childhood treats. Creamy peanut butter and butterscotch chips mixed in with rainbow coloured marshmallows are truly a match made in heaven!
**This post was originally published December 13, 2017 and updated July 30, 2024**
PEANUT BUTTER MARSHMALLOW SQUARES
You know that dessert your grandma brought to every potluck in the ’90s that somehow disappeared in five seconds flat?
Yep, we’re talking about Peanut Butter Marshmallow Squares—the ultimate no-bake, gooey, rainbow-hued butterscotch mixture blast from the past.
These babies are chewy, sweet, salty, and colorful—basically, everything you could ever want in a dessert. You only need a handful of ingredients (and no oven), which means they’re dangerously easy to whip up at any time.
SIMPLE INGREDIENTS YOU NEED FOR THE PEANUT BUTTER MARSHMALLOW SQUARES RECIPE -AKA CONFETTI SQUARES
You will need the following ingredients listed below to make these peanut butter butterscotch marshmallow squares (the exact measurements, nutritional information and full recipe are in the recipe card at the bottom of this post):
- Peanut Butter (Creamy or Crunchy) – for this recipe my grandmother used to always use creamy peanut butter. Can also use natural peanut butter, unsalted peanut butter, or crunchy peanut butter.
- Butterscotch Chips – I typically use the Chipits butterscotch chips. There are lower sugar options like Lilys butterscotch candies, and I’m sure you could also find vegan butterscotch chips as well! Some individuals who have tested out this recipe have also substituted some of the butterscotch chips for regular chocolate chips to cut down the sweetness.
- Butter – regular unsalted butter. You could try this recipe using vegan butter as well if you like or if you’re sensitive to dairy.
- Rainbow Marshmallows – can also use regular mini white marshmallows.
- Vanilla extract
- Optional – Rice Krispies for a crunch, brown sugar, dark chocolate chips, coconut, etc.
HOW TO MAKE PEANUT BUTTER CONFETTI SQUARES
In a large pot over medium-low heat, combine the butterscotch chips, peanut butter and butter. Stir frequently until the mixture is completely melted.
Let cool, and fold in marshmallows and vanilla extract quickly. I like to throw my marshmallows in the freezer for 10 minutes before this step to prevent them from melting all together.
Pour the mixture into a lined 8×8 or 9×9 inch square pan and spread evenly. Refrigerate for 1 hour minimum to set, then cut into bars. Store in refrigerator or freezer in an airtight container (I actually prefer my confetti bars straight from the freezer).
Pro Tip: Freeze your marshmallows first. This keeps them from melting when mixed with the warm peanut butter mixture.
Serve them cold or frozen – the peanut butter + chilled marshmallow combo is unreal. Trust me, they’re even better straight from the freezer instead of room temperature.
CAN I USE CRUNCHY PEANUT BUTTER INSTEAD OF SMOOTH IN THESE NO BAKE PEANUT BUTTER MARSHMALLOW SQUARES?
Yes! Crunchy peanut butter will give the squares a little extra texture and nutty bite. Smooth peanut butter makes them creamier, so it really comes down to preference.
CAN I FREEZE THESE PEANUT BUTTER MARSHMALLOW BARS?
Absolutely. Cut them into squares, place them in a single layer on a baking sheet to freeze, then transfer to a freezer bag or container. They’ll last up to 2–3 months. Just thaw at room temp before eating.
WHY ARE MY MINI MARSHMALLOWS MELTING?
If the peanut butter mixture is too hot when you add the marshmallows, they’ll melt into the squares. To avoid this, let the mixture cool slightly before folding in the marshmallows.
Other Easy Recipes To Curb A Sweet Tooth!
- 3 Ingredient Funfetti Cake Pops
- Chocolate Peanut Butter Crunch Bites
- 5 Ingredient Easy Biscoff Cheesecake
- Chocolate Caramel Shortbread Millionaire Bars
- Christmas Cookie Fudge Recipe
- Easy Chocolate Peppermint Truffles
- Gluten Free Chocolate Fudge Crinkle Cookies
- The Best Brown Butter Rice Krispie Treat
- Chocolate Peanut Butter Pie
- 3-Ingredient Chocolate Peanut Butter Fudge
Peanut Butter Marshmallow Squares Recipe
Ingredients
- 1 package butterscotch chips 300g package (I used Chipits)
- 1 cup crunchy or creamy peanut butter
- ½ cup butter
- 1 package rainbow miniature marshmallows 250g package
- 1 tsp vanilla extract
Instructions
- Put bag of marshmallows in the freezer and line an 8×8 pan with parchment paper.
- Melt butterscotch chips, peanut butter, and butter in a medium saucepan over low heat, stirring until smooth. Remove from heat, and let cool to ensure the marshmallows don't melt in next step.
- Quickly fold in vanilla and marshmallows.
- Spread mixture into 8×8 or 9x9 inch pan and gently spread with a spatula or spoon.
- Refrigerate until firm. Approximately 1 hour.
- Remove from pan and slice into squares. Store squares in refrigerator or freezer.
Notes
Nutrition
The nutrition information provided is calculated based on industry-standard software and should be used as a general guide only. The information may vary depending on ingredient substitutions, cooking techniques, and individual serving sizes. It is the responsibility of the reader to ensure the accuracy and appropriateness of the nutritional information provided. Always consult a qualified healthcare provider for personalized medical or nutritional advice.
About Bailey
I love to bake, cook, exercise, and document all of the above. Nutrition is not low fat. It is not low calorie. It’s not feeling deprived or being hungry all the time. It’s nourishing your body with real, whole foods so that you are consistently satisfied and energized to live your life to the fullest! Read more…
Great recipe make them every year. Really recommend them to people.
Hi Santino,
Thank you SO much for this review! So glad you enjoy them!! 🙂
Great recipe make them every year. Really recommend them to people.
I love this recipe! I do tweek it a bit tho! I make a graham cracker crust for the bottom. Makes true “Smore’s”. I use chocolate chips instead of the butterscotch. I have nothing against butterscotch! Just don’t crave it like chocolate!
Hi Eva,
OKAY THIS SOUNDS DELICIOUS!! I may need to try this in the New Year!! **** drooling
I love this recipe! I do tweek it a bit tho! I make a graham cracker crust for the bottom. Makes true “Smore’s”. I use chocolate chips instead of the butterscotch. I have nothing against butterscotch! Just don’t crave it like chocolate!
Making for my daughter, she loves them. My mom used to make them but put coconut and walnuts in them but my daughter doesn’t want walnuts. Thanks for the recipe
Hello Bails
Thank you for the fabulous recipe! My granddaughter Bails (Bailey) loves these! Just waiting for them to “set up”! Yummy!!
Merry Christmas and all the best in 2022! 🎄🎄
Hi Bonnie! Thank you so much for the 5 star review and I’m so glad you liked these! All the best to you in the New Year as well!!
Hello Bails
Thank you for the fabulous recipe! My granddaughter Bails (Bailey) loves these! Just waiting for them to “set up”! Yummy!!
Merry Christmas and all the best in 2022! 🎄🎄
My daughter loves these and I have never made them. This recipe is very easy, loved the tip about putting the marshmallows in the freezer, it worked well. I used caramel extract instead of vanilla and they were very good. Thanks!
Hi Sandy,
Thank you so much for the 5 star review! Those substitutions sound delicious! Happy Holidays and hope you have an amazing 2022! 🙂
My daughter loves these and I have never made them. This recipe is very easy, loved the tip about putting the marshmallows in the freezer, it worked well. I used caramel extract instead of vanilla and they were very good. Thanks!
I put chopped up apples and cinnamon, extremely delicious.
These are absolutely incredible!!! Truly the best ones I’ve ever had and the freezing of the marshmallows was a very good tip! Thank you!!!!!!
These are absolutely incredible!!! Truly the best ones I’ve ever had and the freezing of the marshmallows was a very good tip! Thank you!!!!!!
We made these over Christmas, they were so easy to make and they are so good! Thank you for sharing this recipe!
We made these over Christmas, they were so easy to make and they are so good! Thank you for sharing this recipe!
My son and I are using salted caramel chips and adding broken pretzels. They are oh so yummy!
I have been using your great recipe for a while now and love them!
What do you think of a chocolate chip butterscotch chip combo? Would it work or do they have too much of a contrast taste.
Thank you
Tony
I’ve made these for years but have never heard of putting the marshmallows in the freezer first what a great idea. And the thought of adding vanilla just blew my mind. I making these with sunflower butter for my mother-in-law Hope she appreciates the different flavour and texture versus the peanut butter. Thank you very much for your recipe.
Hi Cheryl,
Thank you so so much for this 5 star review!!
I’ve made these for years but have never heard of putting the marshmallows in the freezer first what a great idea. And the thought of adding vanilla just blew my mind. I making these with sunflower butter for my mother-in-law Hope she appreciates the different flavour and texture versus the peanut butter. Thank you very much for your recipe.
So delicious!!! My mom use to make these. Reminds me of Home. Thank you!! 💞💞🫂
Hi Joanne,
They are so nostalgic for me as well because my grandmother used to make them for us all the time! Thanks so much for the 5 star review! 🙂
So delicious!!! My mom use to make these. Reminds me of Home. Thank you!! 💞💞🫂