Peanut Butter Marshmallow Squares

Name: Peanut Butter Marshmallow Squares
Prep time: 10 min
Total time: 70 min
Ingredients: 300 g chocolate (butterscotch, Caramilk or white chocolate); 250 g (1 cup) peanut butter (smooth or crunchy); 115 g (1/2 cup) butter; 250 g mini marshmallows

Jump to Recipe

These creamy and delicious peanut butter marshmallow squares are made from just 4 ingredients, take only 10 minutes to prepare and no baking required!

Simple, no-bake peanut butter squares with pops of soft marshmallow are the perfect treat... guaranteed to satisfy any sweet craving!

Close up of a peanut butter marshmallow square on a white cake stand.

These butterscotch squares with marshmallows and peanut butter, also known as confetti squares, are the easiest no-bake slice and they take just minutes to prepare!

With soft, creamy peanut butter and chocolate, and bursts of chewy sweet marshmallows throughout, marshmallow peanut butter squares are sure to please any sweet tooth!

Alongside peanut butter crunch bars, peanut butter oatmeal bars, peanut butter slice, Crunchie slice and rocky road, these peanut butter confetti squares are ALWAYS popular at kids parties, bake sales and fetes!

Top view of butterscotch marshmallow square on white plate.

Why You're Going To Love This Recipe

Easy recipe - made from just 4 ingredients and taking 10 mins to prepare, butterscotch marshmallow squares are so quick and easy to make!
No bake - there is no need to turn the oven on for this recipe!
Freezer-friendly - these bars freeze well, making them perfect for quick 'grab n go' snacks.
Conventional and Thermomix - both methods are written in the recipe card at the end of the post.

What You Need

You only need 4 ingredients to make butterscotch confetti squares!

Note: Scroll to the recipe card at the bottom for the ingredients quantities and full detailed method.

The four ingredients needed to make the recipe.

Chocolate - you can use butterscotch chocolate (my favourite!), Caramilk or white chocolate.
Peanut butter - you can use either smooth or crunchy peanut butter. I recommend using store bought peanut butter rather than homemade peanut butter.
Butter - unsalted butter or salted butter, either is fine to use.
Mini marshmallows - these are easy to find at your local supermarket, usually in the baking section. Rainbow mini marshmallows are really pretty to use in this slice, but you can also use pink and white mini marshmallows. If you cannot find mini marshamallows, you could always cut up regular pink and white ones.

Equipment Required

You don't need any fancy equipment to make these super fun marshmallow peanut butter squares, just:

Heatproof bowl
Microwave, saucepan, or Thermomix.
20cm x 20cm square tin lined with baking paper.

Squares of a caramilk chocolate and peanut butter slice filled with colourful mini marshamllows.

Step By Step Instructions

Making these delicious chocolate peanut butter marshmallow squares is as easy as 1...2...3!

Note: Scroll to the recipe card at the bottom for the ingredients quantities and full detailed method.

Step 1 - Melt The Chocolate, Peanut Butter And Butter

Grease and line a square tin and set aside.

Place the chocolate, peanut butter and butter in a heatproof bowl.

Butter, peanut butter and Caramilk chocolate in a heatproof bowl.

Gently melt in the microwave or place on a pan of simmering water on the stove top, stirring until smooth. Leave to cool.

The melted butter, chocolate and peanut butter stirred until smooth.

Step 2 - Add The Mini Marshmallows

Add the mini marshmallows to the cooled mixture.

Marshmallows added to the peanut butter chocolate mixture.

Quickly stir until the marshmallows are thoroughly coated in the peanut butter and chocolate mixture.

The mini marshmallows stirred in to the chocolate peanut butter mixture.

Step 3 - Place In The Lined Tin

Spread the mixture very firmly into the prepared tin then place in the fridge to set for at least an hour.

The mixture poured in to a lined square tin.

Once set, cut in to squares and enjoy!

Close up of a cut peanut butter marshmallow square on white baking paper.

Expert Tips

Peanut Butter - store-bought peanut butter works better in this recipe than homemade or natural peanut butter.
Melting - you can melt the ingredients in the microwave, on the stove-top or in a Thermomix.
Don't add the marshmallows to the hot chocolate butter mixture - allow it to cool, otherwise they will melt and you'll end up with a sticky mess!
Setting time - leave in the fridge to set for a minimum of 1 hour.
Cutting the slice - remove from the fridge 30 minutes before you want to cut the slice. Use a sharp knife to cut the room temperature slice. See my post for more tips to cut perfect slices.
Storing - store in an airtight container in the fridge for up to 1 week.

FAQs

Can I freeze peanut butter marshmallow squares?

Yes! These peanut butter marshmallow squares can be frozen for up to a month. Wrap them well, and defrost in the refrigerator overnight.

Why are my peanut butter marshmallow squares crumbly?

If your squares are crumbly it is likely that you heated the chocolate, peanut butter and butter over a too high heat and the sugars crystallised, creating a crumbly texture.

Confetti butterscotch squares on a white cake stand.

Love peanut butter? Me too! Here are more of my favourite recipes with peanut butter:

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