🥜🍬 Peanut Butter Marshmallow Squares — Chewy, Butterscotch & No-Bake!
Looking for a quick, colorful treat that everyone will love? These Peanut Butter Marshmallow Squares are the perfect combination of creamy peanut butter, sweet butterscotch, and soft, fruity mini marshmallows! With just five simple ingredients and no oven required, this nostalgic treat comes together in minutes and is perfect for holiday trays, birthday parties, bake sales, and sweet afternoon snacks.
The magic happens when melted butterscotch chips, butter, and peanut butter combine to create a smooth, rich coating that holds the marshmallows together. Once chilled, the mixture becomes a deliciously chewy, sliceable treat with colorful marshmallow pieces in every bite.
They’re sweet, creamy, slightly nutty, and wonderfully easy to make. Prepare a batch, chill until firm, and watch these cheerful squares disappear! ❤️
Recipe Details
- Prep Time: 10 minutes
- Cook Time: 5 minutes
- Chilling Time: 1–2 hours
- Total Time: Approximately 1 hour 15 minutes
- Yield: 24–30 squares
- Course: Dessert, Snack
- Cuisine: American-inspired
- Difficulty: Easy
- Method: No-bake, stovetop or microwave
Ingredients
- ½ cup (113 g) unsalted butter
- 1 cup (approximately 250 g) creamy peanut butter
- 1 bag (11 oz / 312 g) butterscotch chips
- 1 teaspoon vanilla extract
- 1 bag (10 oz / 283 g) fruity mini marshmallows
Instructions
Step 1: Prepare the Pan
Line a 9 × 13-inch (23 × 33 cm) baking pan with parchment paper, leaving some overhang along the sides so you can lift the squares out easily.
For thicker squares, use an 8 × 8-inch (20 × 20 cm) pan, keeping in mind that the mixture will be deeper and may need longer chilling time.
Set the pan aside while you prepare the mixture.
Step 2: Melt the Butter, Peanut Butter, and Butterscotch Chips
In a medium saucepan, combine the butter, creamy peanut butter, and butterscotch chips.
Place over low heat, stirring constantly until everything melts into a smooth, glossy mixture. This usually takes about 3–5 minutes.
Alternatively, combine the ingredients in a microwave-safe bowl and microwave in 20-second intervals, stirring thoroughly after each interval, until smooth.
Avoid overheating the butterscotch chips, as they can become thick or grainy if exposed to excessive heat.
Step 3: Add the Vanilla Extract
Remove the saucepan from the heat and stir in the vanilla extract.
Mix until fully incorporated.
Allow the mixture to cool for approximately 10–15 minutes, stirring occasionally. It should still be pourable but should no longer feel hot.
Important: Letting the mixture cool before adding the marshmallows helps prevent them from melting into the butterscotch mixture and losing their colorful shape.
Step 4: Fold in the Fruity Mini Marshmallows
Place the fruity mini marshmallows in a large mixing bowl.
Pour the cooled peanut butter and butterscotch mixture over them. Using a rubber spatula, fold gently until all the marshmallows are evenly coated.
Work quickly but carefully, making sure not to crush the marshmallows. You want to preserve the colorful pieces throughout the mixture for that classic marshmallow-square appearance.
Step 5: Transfer to the Prepared Pan
Spoon the mixture into the prepared pan.
Using a lightly greased spatula or a piece of parchment paper, gently press the mixture into an even layer.
Avoid pressing too firmly, as compacting the squares excessively can make them dense rather than pleasantly chewy.
Smooth the top and spread the marshmallows evenly into the corners.
Step 6: Chill Until Firm
Cover the pan and refrigerate for 1–2 hours, or until the mixture is completely firm.
For thicker squares, allow extra chilling time if needed. The peanut butter and butterscotch mixture should set firmly enough to cut cleanly without sticking excessively to the knife.
Step 7: Cut into Squares
Lift the chilled mixture out of the pan using the parchment paper overhang.
Place it on a cutting board and use a sharp knife to cut it into 24–30 squares, depending on your preferred size.
For cleaner cuts, run the knife under warm water, wipe it completely dry, and slice. Repeat between cuts if the mixture begins sticking.
Step 8: Serve and Enjoy
Arrange the squares on a serving platter or place them in decorative paper candy cups.
Serve chilled or allow them to stand at room temperature briefly for a softer, chewier texture.
Enjoy the combination of creamy peanut butter, sweet butterscotch, and fruity marshmallows in every colorful bite! 🥜🍬
Tips for Perfect Peanut Butter Marshmallow Squares
- Melt over low heat. Butterscotch chips can scorch or become grainy if heated too quickly.
- Use creamy peanut butter. Conventional creamy peanut butter generally provides a smooth, consistent texture. Natural peanut butter may separate or make the squares softer.
- Cool the mixture before adding marshmallows. This is the key to keeping the marshmallows intact rather than melting them.
- Fold gently. Careful mixing keeps the colorful marshmallow pieces evenly distributed.
- Don’t press too firmly. A gentle, even press gives the squares a better chewy texture.
- Line the pan with parchment paper. This makes removal much easier and helps produce neat edges.
- Chill thoroughly. Cutting the mixture before it is fully set can result in sticky, uneven squares.
- Use a warm, dry knife. This helps produce clean edges without dragging the marshmallows through the mixture.
Delicious Variations
🍫 Chocolate Peanut Butter Marshmallow Squares
Replace half the butterscotch chips with semisweet chocolate chips for a richer chocolate-peanut butter flavor.
🥜 Crunchy Peanut Butter Squares
Replace some or all of the creamy peanut butter with crunchy peanut butter for a little extra texture.
🌈 Rainbow Marshmallow Squares
Use colorful fruity mini marshmallows and add a tablespoon of rainbow sprinkles to the mixture for a fun party treat.
🥥 Coconut Butterscotch Squares
Fold in ½ cup shredded coconut for a chewy, coconutty twist that pairs beautifully with butterscotch.
🍪 Peanut Butter Cookie Squares
Add ½ cup finely crushed vanilla cookies or graham crackers for extra crunch and a slightly firmer bite.
🍬 Chocolate Drizzle Squares
Once the squares have set, drizzle melted semisweet or white chocolate over the top. Allow the chocolate to firm before cutting or serving.
🎄 Holiday Marshmallow Squares
Use red-and-green fruity marshmallows when available, then drizzle with white chocolate for a festive holiday version.
Serving Suggestions
These colorful squares are perfect for almost any gathering. Serve them with:
- Hot chocolate or coffee
- A glass of cold milk
- Homemade cookies and brownies
- Chocolate truffles and fudge
- Holiday dessert platters
- Sweet-and-salty snack boards with pretzels
For holiday gifts, place the squares in mini paper candy cups and arrange them in a decorative tin lined with parchment paper. Their colorful marshmallow centers make them especially attractive on Christmas treat trays.
Make-Ahead and Storage
Room-temperature storage: Store the squares in an airtight container in a cool, dry place for up to 2 days if your kitchen is cool. They may soften in warmer conditions.
Refrigeration: For the best texture and shape, store the squares in an airtight container in the refrigerator for up to 1 week. Separate layers with parchment paper to prevent sticking.
Freezing: Place the squares in a freezer-safe container, separating layers with parchment paper, and freeze for up to 2 months for best quality. Thaw in the refrigerator or briefly at room temperature before serving. The marshmallows may become slightly chewier after freezing.
Make ahead: Prepare the squares a day or two before your event and keep them covered in the refrigerator until serving.
Frequently Asked Questions
Why did my marshmallows melt?
The peanut butter and butterscotch mixture was probably too hot when the marshmallows were added. Allow it to cool for 10–15 minutes after removing it from the heat, stirring occasionally, before folding in the marshmallows.
Why are my squares too soft?
They may need more chilling time, or the mixture may have been overheated or made with peanut butter that separates easily. Refrigerate until fully firm and use conventional creamy peanut butter for the most consistent result.
Can I use regular mini marshmallows instead of fruity ones?
Absolutely! Plain mini marshmallows work well and create a classic peanut butter-butterscotch treat. The flavor will be slightly less fruity, but the texture will remain delicious.
Can I use a different kind of baking chip?
Yes. White chocolate chips or semisweet chocolate chips can replace some or all of the butterscotch chips. The taste and sweetness will change, and some chocolate brands may melt differently, so heat gently.
Do I need to bake these squares?
No! This is a completely no-bake recipe. The mixture sets in the refrigerator, so there’s no need to turn on the oven.
How do I make the squares less sweet?
Butterscotch chips and fruity marshmallows are naturally sweet, so these squares are intended to be a sweet treat. You can replace a portion of the butterscotch chips with semisweet chocolate chips to create a less-sweet flavor balance.
Can I make these in a smaller pan?
Yes. An 8 × 8-inch pan produces thicker squares than a 9 × 13-inch pan. Because the mixture will be deeper, you may need a little extra chilling time before cutting.
Can I cut the squares while they’re still warm?
It’s best to wait until they’re completely firm. Cutting too early can cause the mixture to stick to the knife and the marshmallows to pull out of place.
❤️ A Colorful, Chewy Treat Everyone Will Love
These Peanut Butter Marshmallow Squares are proof that a handful of simple ingredients can create a wonderfully memorable dessert. Creamy peanut butter, sweet butterscotch chips, vanilla, and fruity marshmallows come together in a cheerful no-bake treat that’s perfect for sharing.
Make them for Christmas cookie trays, birthday parties, potlucks, or a quick homemade sweet whenever the craving strikes. Chill, slice, and enjoy every chewy, colorful bite! 🥜🍬✨