Classic Confetti Squares: The Ultimate No-Bake Peanut Butter Butterscotch Marshmallow Treat

Step back in time with a truly delightful and incredibly easy no-bake dessert: Confetti Squares. This old-fashioned recipe brings together the irresistible flavors of creamy peanut butter and rich butterscotch, studded with soft, squishy marshmallows. A true Canadian classic, these bars are renowned for their simplicity, delightful texture, and nostalgic charm, making them a perfect treat for any occasion, from family gatherings to quiet evenings at home.

Peanut butter marshmallow bars cut into squares on a sheet, showcasing their colorful marshmallow flecks. — Delicious Confetti Squares ready to be devoured.

Imagine this: a velvety blend of melted peanut butter and butterscotch chips, cooling just enough to hug plump, colorful mini marshmallows. The result is a fudge-like confection that’s sweet, savory, and wonderfully chewy. For many, Confetti Squares are a taste of childhood, a staple on every holiday cookie platter and school bake sale table across Canada. Interestingly, an informal poll on my Instagram story revealed that a significant portion of my international audience wasn’t familiar with these delicious gems, cementing their status as a distinctly Canadian treasure. If you haven’t experienced the magic of these peanut butter butterscotch bars, you’re in for a treat that will quickly become a cherished favorite.

Why Confetti Squares Are a Must-Try Canadian Classic

Confetti Squares, often also known as Peanut Butter Butterscotch Squares, embody the spirit of simple, heartwarming baking. They require no oven, minimal ingredients, and very little fuss, yet they deliver maximum flavor and satisfaction. This ease of preparation, combined with their incredible taste and vibrant appearance (especially when using colored marshmallows), makes them a perennial favorite. Growing up in Canada, these sweet, chewy squares were an absolute staple, a fixture at every potluck, picnic, and celebratory spread. Their unique combination of sweet and slightly salty flavors, with that signature marshmallow chew, sets them apart from other no-bake bars.

An Effortless No-Bake Peanut Butter Confetti Square Recipe

One of the greatest appeals of Confetti Squares is their straightforward, no-bake nature. You don’t need fancy equipment or advanced culinary skills to whip up a batch of these delectable treats. The process is remarkably simple, making it an ideal recipe for beginners, busy parents, or anyone craving a quick and satisfying dessert. All you truly need is a large, microwave-safe bowl or measuring cup, a sturdy spatula, and a baking pan to bring these squares to life.

Simple Steps to No-Bake Perfection:

The magic begins with a gentle melt. Combine creamy peanut butter, rich butter, and those unmistakable butterscotch chips in your microwave-safe container. A brief stint in the microwave transforms these ingredients into a luscious, molten mixture. This warm, fragrant base is then poured over a bed of mini marshmallows in your prepared baking pan. A quick stir ensures every marshmallow is coated in the sticky, sweet goodness. The final, crucial step? Chilling time, which transforms the soft mixture into firm, sliceable bars.

For the easiest lifting and cleanup, a simple trick makes all the difference: lining your baking pan with parchment paper. This creates a non-stick surface, allowing you to effortlessly lift the entire slab of Confetti Squares out of the pan once they’re firm. This means perfectly cut squares and virtually no mess to scrub later!

Peanut butter marshmallow butterscotch treats cut into strips, ready for final slicing into individual squares. — Confetti Squares cooling and firming up before final cutting.

Chilling for the Best Butterscotch Peanut Butter Marshmallow Squares

While the actual “cooking” time for these squares is minimal, the chilling phase is paramount for achieving the perfect texture and flavor. Rushing this step might lead to gooey, unmanageable bars. Patience truly is a virtue here, but don’t worry, it’s worth the wait!

Firmness and Flavor: Refrigerating your Confetti Squares not only helps them firm up faster, allowing you to enjoy them sooner, but it also enhances their taste. There’s something uniquely satisfying about the chewiness of a cold marshmallow combined with the creamy, rich base. The flavors seem to meld and intensify when chilled, offering a more profound and delightful experience with every bite.
The Marshmallow Secret: Here’s a pro tip that makes a huge difference: toss your bag of mini marshmallows into the freezer for about 15-20 minutes before you start the recipe. This pre-chilling step ensures that when the warm peanut butter-butterscotch mixture hits them, they won’t melt into an indistinguishable goo. Instead, they’ll maintain their distinct shape and signature squishy texture, which is key to the “confetti” effect and overall appeal of these bars.

Confetti Square Ingredient Notes

While the recipe uses only a few ingredients, choosing the right ones can significantly impact the final taste and texture of your Confetti Squares. Here’s what you need to know:

Marshmallows: While white mini marshmallows work perfectly well, don’t shy away from using the colored variety! Those vibrant, fruit-flavored mini marshmallows add an extra layer of fun and a subtle, delightful tang that complements the sweet and savory base. It might sound a little unconventional, but trust me, the burst of color and unexpected flavor is a fantastic addition.
Peanut Butter: This is a crucial component, so opt for quality. I strongly recommend using regular, creamy peanut butter – the kind that comes in a jar and is smooth and consistently flavored. Avoid the gritty, natural, grind-your-own-at-the-store varieties that often lack salt and can have an inconsistent texture. For these squares, a good quality, salted creamy peanut butter provides a wonderful contrast to the sweet butterscotch, elevating the overall flavor profile. If you only have unsalted, a pinch of fine sea salt can be added to the melted mixture.
Butterscotch Chips: These chips are the heart of the butterscotch flavor. Ensure they are fresh for the best melting and taste. While chocolate chips can be substituted for a different flavor profile, true Confetti Squares shine with butterscotch.
Butter: Use unsalted butter for better control over the saltiness, especially if your peanut butter is already salted. If using salted butter, you might want to slightly reduce any additional salt you plan to add.

Tips for Perfect Confetti Squares Every Time

Don’t Overcook the Melted Mixture: When microwaving the peanut butter, butter, and butterscotch chips, use 50% power and stir frequently. Overheating can cause the butterscotch to seize or become grainy. You want a smooth, flowing mixture.
Cool Slightly Before Adding Marshmallows: If your butterscotch mixture is too hot, even frozen marshmallows will melt too much. Let it cool for a few minutes (until it’s warm but not scalding) before pouring it over the marshmallows.
Even Distribution: Once you pour the mixture over the marshmallows, stir quickly but gently to ensure all marshmallows are coated and evenly distributed throughout the pan.
Press Down Firmly: After spreading the mixture into the pan, use a spatula or the back of a spoon to press it down firmly and evenly. This helps create compact bars that won’t crumble when cut.
Cutting Technique: For clean cuts, use a sharp, warm knife. You can warm the knife by running it under hot water and wiping it dry between each cut. This prevents the sticky bars from clinging to the blade.

Creative Variations for Your Confetti Squares

While the classic recipe is perfect as is, these no-bake bars are also wonderfully adaptable. Feel free to experiment with these delicious variations:

Chocolate Confetti Squares: As mentioned in the recipe notes, swapping butterscotch chips for semi-sweet or milk chocolate chips creates an equally delightful chocolate version.
Nutty Crunch: For an added layer of texture and flavor, fold in 1/2 cup of chopped peanuts, pecans, or walnuts along with the marshmallows.
Holiday Twist: Add a festive touch by using holiday-themed sprinkles or specific colored marshmallows (e.g., red and green for Christmas, pastel for Easter).
Salted Caramel Delight: Drizzle a thin layer of homemade or store-bought salted caramel over the top of the chilled bars before cutting for an extra decadent touch.
White Chocolate Dream: Substitute white chocolate chips for the butterscotch chips for a creamy, sweet alternative.

More Popular Canadian Dessert Recipes

If you’re loving this taste of Canadian dessert traditions, be sure to explore these other fantastic recipes:

Best-Ever Homemade Nanaimo Bars

Easy Ginger Rhubarb Cake

Peanut Butter Rice Krispie Treats with Salted Caramel and Chocolate

Famous Apple Pie Cake

Close-up of Confetti Squares, showing the texture and marshmallow pieces.

Pin Recipe
Print Recipe

5 out of 5 stars (based on 1 rating)

Peanut Butter Butterscotch Squares (aka Classic Confetti Squares!)

By:
Jennifer Pallian BSc, RD

Peanut Butter Butterscotch Bars, lovingly known as Confetti Squares, are a beloved nostalgic childhood treat. This easy, no-bake recipe combines the creamy richness of peanut butter and butterscotch with the delightful chewiness of marshmallows.

Prep Time:
5 minutes

Cook Time:
3 minutes

Total Time:
8 minutes

Yields:
24 servings

Ingredients

1 bag butterscotch chips (10 oz or 300 g)
1 cup creamy peanut butter
½ cup butter
4 cups mini marshmallows (white or colored)

Instructions

Combine butterscotch chips, creamy peanut butter, and butter in a large microwave-safe dish. Microwave on 50% power for 2 minutes. Remove, stir well, then microwave for another 1 minute on 50% power until fully melted and smooth. Allow the mixture to cool slightly for about 5 minutes.
Line an 8×8-inch (20×20 cm) square baking pan with parchment paper, leaving an overhang on the sides for easy lifting. Evenly spread the mini marshmallows in the prepared pan. Once the butterscotch mixture has cooled slightly, pour it over the marshmallows. Stir gently to ensure all marshmallows are coated, then spread the mixture evenly across the pan. Refrigerate until firm, which typically takes about 1 hour.

Notes

For a delicious variation, swap the butterscotch chips for chocolate chips to create a classic chocolate marshmallow square!

Tried this classic recipe? We’d love to hear your thoughts! Leave a comment below and share your experience.

Storing and Serving Your Confetti Squares

Once your Confetti Squares are perfectly firm, remove them from the pan using the parchment paper overhang and slice them into 24 even squares. For the best flavor and texture, store them in an airtight container in the refrigerator for up to 1 week. They are excellent when served cold, offering a delightful chewiness that softens beautifully as they come to room temperature. These squares are perfect as a quick snack, a lunchbox treat, or a delightful addition to any dessert spread. Pair them with a glass of cold milk or a warm cup of coffee for an ultimate indulgence.

Confetti Squares are more than just a dessert; they are a cherished memory, a simple pleasure, and a testament to the enduring appeal of no-bake treats. Whether you’re rediscovering a childhood favorite or trying them for the very first time, these peanut butter butterscotch marshmallow bars are sure to bring a smile to your face. Enjoy the sweet, simple goodness!