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This butterscotch confetti squares recipe with colored marshmallows are a great sweet treat for anyone with a sweet tooth. There are only six different ingredients in these peanut butter marshmallow squares, and you won’t believe how easy they are to make. In fact, the hardest part of making this no-bake bar is having to wait an hour for them to set in the fridge.

Peanut butter butterscotch confetti squares with colour marshmallows cut into squares.

Confetti squares are smooth, fudgy and dense when chilled or silky, creamy and chewy with mini marshmallows at room temperature. The combination of peanut butter, mini marshmallows, butterscotch, vanilla, butter, and a pinch of salt comes together for perfection!

You won’t regret these marshmallow confetti squares as they’re amazing, but for more crowd-pleasing options, try this cream cheese brownies recipe or whip up some adorable mini cone cupcakes. These peanut butter and chocolate cupcakes are also addictive!

A stack of confetti squares.

Why You’ll Love These

Colourful:  Sweet recipes don’t have to be colourful to be appealing. After all, would you say no to a square of your favourite chocolate or a block of fudge? The colourful appearance of these confetti squares makes them look extra-appealing, and very pretty.
Simple: Making peanut butter confetti squares is easy because you must melt butter and mix the ingredients before letting it set. That’s all! No baking is required.
Deliciously Different: There are plenty of recipes with mini marshmallows, plenty with butterscotch chips, and lots with peanut butter. This recipe, however, brings them all together with a couple of other tasty ingredients for a deliciously different sweet treat.

Side view of a confetti squares.

Peanut Butter Butterscotch Confetti Squares Ingredients

The recipe (which is a Canadian favourite) calls for butterscotch chips, salted butter, vanilla extract, mini rainbow marshmallows, peanut butter, and a pinch of salt. If you love peanut butter, marshmallows, and other sweet ingredients, wait until you take your first bite!

Ingredients to make a peanut butter butterscotch confetti squares recipe.

How to Make This Confetti Squares Recipe

For more detailed instructions with weights and measurements, jump to the printable recipe card.

Prepare a baking pan: Line a 9-inch square baking pan with wax paper, then add cooking spray.
Melt some of the ingredients together: Heat and stir the butterscotch chips, peanut butter, and salted butter together in a pan over medium heat until smooth.
Add the other ingredients: Add the vanilla extract and salt, and then all except a cup of rainbow marshmallows. Be quick here – you don’t want the mixture to cool too much, and set before you mix in the marshmallows!
Add the confetti squares mixture: Spoon it into the prepared pan and press down, then sprinkle the reserved mini marshmallows on top and press them down to stick.
Chill the peanut butter confetti squares: Let the mixture cool to room temperature, then chill in the fridge for an hour or until set. Cut into squares and serve.

Making confetti squares.
Butterscotch confetti squares cut into squares.

Substitutions and Variations

If you only have unsalted butter, you can use that in the confetti squares recipe and just add a pinch of salt to the recipe (this really brings out the sweet flavors and stops it from being too sweet).

Packing up cut confetti squares.

Feel free to use crunchy peanut butter if you prefer that kind of you want some crunch in your marshmallow bars. Chocolate chips are nice in here, either regular chocolate chips or another kind.

Cutting confetti squares on a board.

Chopped nuts, raisins, or shredded coconut would work in peanut butter confetti squares too. You could even add Rice Krispies for texture or another favourite fruit-flavored cereal. Chop regular marshmallows into small pieces if you don’t have mini marshmallows.

Peanut butter butterscotch marshmallow squares.

What to Serve with a Butterscotch Confetti Squares Recipe

These make a nice treat paired with a cup of coffee or iced tea, or you could even package them up in cellophane as gifts. Chop them small, and you can use them as an ice cream sundae topping.

No bake marshmallow squares stacked.

How to Store Confetti Bars

Store:  Keep them in an airtight container for up to a week.
Freeze:  You can freeze them with parchment paper between each piece to stop them from sticking together. They will be good for up to 3 months but will start to lose their taste and their flavor if frozen for longer. Thaw at room temperature or in the refrigerator.

No bake confetti bars on parchment.

Peanut Butter Marshmallow Squares FAQs

What is the origin of peanut butter confetti squares?

This is a Canadian recipe, also known as confetti slice, rainbow squares, Grandma’s squares, peanut butter squares, Christmas jumbles, and stained glass windows (not to be confused with stained glass Christmas cookies). It’s popular at weddings, potlucks, and funerals.

Can you make these bigger or smaller?

Yes, absolutely. As you make the peanut butter marshmallow squares in a square bowl, you can cut them into 3 rows of 3, 4 rows of 4, or 5 rows of 5 – whatever size you want them to be.

Can you make these peanut butter butterscotch chips treats gluten-free?

Nearly all marshmallow brands are gluten-free, including Kraft, Savion and Doumak, but check the label to make sure. Hershey’s butterscotch chips are gluten-free, as are Baker’s Corner, which would work in the butterscotch squares.

A no bake chocolate peanut butter marshmallow square.

Confetti Square Recipe

5 from 68 votes

Confetti Squares

By: Bella Bucchiotti
Peanut butter butterscotch confetti squares with coloured marshmallows are a great sweet treat for anyone with a sweet tooth.
Prep Time: 15 minutes
Chill time: 1 hour
Total Time: 1 hour 15 minutes
Servings: 16 Bars


  • 1 ⅓ Cups butterscotch chips
  • 1 ¼ Cups peanut butter, creamy
  • 6 Tablespoons salted butter
  • 2 Teaspoons vanilla
  • ½ Teaspoon salt
  • 14 Ounces mini marshmallows, rainbow


  • Prepare a 9×9 pan by lining with parchment paper and spraying lightly with oil.
  • In a sauce pot combine the butterscotch chips with the peanut butter and butter. Heat over medium-low, stirring constantly until the butterscotch chips have melted and the mixture is smooth.
  • Add the salt and vanilla, mix to combine.
  • Set about 1 cup of the marshmallows aside, then add the remaining marshmallows to the butterscotch mixture and fold to combine.
  • Press the mixture into the prepared 9×9 pan firmly.
  • Cover the top with the cup of reserved marshmallows, gently pat them down to ensure they stick to the bars.
  • Let chill in the refrigerator for at least 1 hour or until solid.
  • Cut into squares before serving. Store in an airtight container in the fridge for up to 1 week.


Calories: 294kcal | Carbohydrates: 38g | Protein: 5g | Fat: 15g | Saturated Fat: 5g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 6g | Trans Fat: 0.2g | Cholesterol: 13mg | Sodium: 268mg | Potassium: 117mg | Fiber: 1g | Sugar: 28g | Vitamin A: 145IU | Calcium: 13mg | Iron: 0.4mg
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Butterscotch confetti squares are a delicious and easy dessert made with butterscotch chips, peanut butter, mini marshmallows, and more. No baking is involved, and the combination of melted butterscotch chips, peanut butter, and more make these perfect for a special occasion.

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Bella Bucchiotti

Bella Bucchiotti is a Canadian-based syndicated food, travel, and lifestyle writer, photographer, and creator at xoxoBella. She founded xoxoBella in 2015, where she shares her love for food, dogs, sustainability, fitness, crafts, outdoor adventures, travel, and philanthropy to encourage others to run the extra mile, try new recipes, visit unfamiliar places, and stand for a cause. Bella creates stress-free and family-friendly recipes for weeknight dinners and festive feasts.


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