If you are searching for a delightful treat that perfectly combines the rich, nutty flavor of peanut butter with the sweet, fluffy texture of marshmallows, you’ve found it in this Peanut Butter Marshmallow Squares Recipe. This nostalgic dessert blends butterscotch chips with a creamy peanut butter base and colorful rainbow marshmallows to create squares that are chewy, buttery, and utterly irresistible. Whether you’re planning a simple snack or a crowd-pleasing party dessert, these squares bring together simple ingredients in a way that’s both comforting and exciting—each bite a perfect balance of texture and sweetness.

Ingredients You’ll Need

A silver pot filled with small, soft pastel marshmallows in colors like pink, green, yellow, and white, topped with a layer of white shredded coconut flakes. A yellow spoon with a white handle rests inside the pot, which is placed on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

Gathering the ingredients for this recipe is straightforward, yet each component is crucial to creating the perfect balance of flavor and texture. From the melty butterscotch chips that add a golden sweetness to the peanut butter that provides that beloved savory contrast, every ingredient plays a vital role.

Butterscotch chips (300g package): Adds a rich, buttery sweetness essential for binding and flavor depth.
Peanut butter (1 cup): Choose crunchy or creamy depending on your preferred texture; it gives the squares their signature nutty taste.
Butter (1/2 cup): Provides a silky richness that helps the mixture set perfectly.
Rainbow miniature marshmallows (250g package): Adds colorful bursts of sweetness and a chewy contrast.
Vanilla extract (1 tsp): Enhances flavors with a warm, aromatic note.

How to Make Peanut Butter Marshmallow Squares Recipe

Step 1: Prep the Marshmallows and Pan

Begin by placing the bag of marshmallows in the freezer to keep them firm during mixing, which prevents them from melting prematurely and losing their delightful chewiness later on. At the same time, prepare an 8×8 inch pan by lining it with parchment paper—this ensures your squares come out smoothly without any sticking.

Step 2: Melt the Butterscotch, Peanut Butter, and Butter

In a medium saucepan set to low heat, combine the butterscotch chips, peanut butter, and butter. Stir constantly until everything melts together into a perfectly smooth, luscious mixture. This slow melting is key to a creamy texture and smooth flavor with no graininess from the chips. Remove from heat and allow it to cool slightly so it doesn’t melt the marshmallows upon folding in.

Step 3: Fold in Vanilla and Marshmallows

Once the mixture has cooled just enough, quickly stir in the vanilla extract for an extra layer of flavor, then gently fold in the frozen marshmallows. The marshmallows should stay mostly intact to provide those delightful pockets of sweet, chewy texture throughout.

Step 4: Spread the Mixture in the Pan

Transfer the marshmallow mixture into your prepared pan. Use a spatula or spoon to gently spread and press the mixture evenly. Treat it with care to keep the marshmallows distributed throughout; pressing too hard might flatten them too much.

Step 5: Chill Until Firm

Place the pan in the refrigerator and chill for about one hour, allowing the squares to set completely. This step ensures that every piece holds together beautifully yet remains soft and chewy—just like fresh fudge.

Step 6: Slice and Store

After chilling, lift the parchment paper to remove the set mixture from the pan. Slice it into 20 squares using a sharp knife. Store the squares in the refrigerator for up to a week or freeze them to keep fresh for longer, making it easy to enjoy this treat anytime.

How to Serve Peanut Butter Marshmallow Squares Recipe

A square tray of 16 small bars with a light brown, smooth caramel-like base mixed with colorful mini marshmallows in pastel tones of yellow, green, pink, and white evenly spread throughout. One bar is lifted slightly above the others, showing the thick, chewy texture and marshmallows inside. The tray rests on crumpled white parchment paper placed on a white marbled surface. Some marshmallows are scattered around the tray. A pink cloth is at the top right corner, and a glass bottle of milk is visible at the top left. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Elevate your serving presentation by garnishing with a sprinkle of crushed peanuts on top for extra crunch or a light dusting of powdered sugar for a touch of elegance. You could also drizzle some melted chocolate or butterscotch sauce over the squares for a decadent, irresistible look.

Side Dishes

These squares pair beautifully with a cold glass of milk to balance the sweetness, or alongside a scoop of vanilla ice cream for an indulgent dessert experience. For a fun twist, serve with fresh berries or a dollop of whipped cream to add a bit of brightness and freshness.

Creative Ways to Present

Turn your Peanut Butter Marshmallow Squares Recipe into the star of any party by presenting the squares on a bright, colorful platter to match the rainbow marshmallows inside. You could also use cupcake liners to make individual portions, making them perfect for grab-and-go snacking or gifting.

Make Ahead and Storage

Storing Leftovers

Leftover squares are best stored in an airtight container in the refrigerator to maintain freshness and prevent the marshmallows from drying out. This keeps them chewy and delicious for days, making a great on-hand snack.

Freezing

If you want to keep these squares for an extended period, they freeze beautifully. Wrap the squares individually or layer them between parchment paper inside a freezer-safe container. When you’re ready to enjoy, just thaw them overnight in the refrigerator.

Reheating

Reheating is not usually necessary as the squares taste great cold or at room temperature. However, if you’d like to soften them slightly, a few seconds in the microwave can bring back a fresh, chewy texture. Just be careful not to overheat or the marshmallows might melt.

FAQs

Can I use a different type of peanut butter?

Absolutely! Creamy peanut butter gives a smoother texture, while crunchy adds an extra bit of bite. Both work beautifully in this recipe, so choose based on your favorite flavor and texture.

Are these squares gluten-free?

Yes, this Peanut Butter Marshmallow Squares Recipe is naturally gluten-free, but always double-check the labels on marshmallows and butterscotch chips to ensure they meet your dietary needs.

Can I substitute the butterscotch chips?

You can try white chocolate or butterscotch-flavored chips, but keep in mind that the flavor profile will shift. Butterscotch chips add a signature warm sweetness that pairs perfectly with peanut butter and marshmallows.

How do I prevent the marshmallows from melting?

Chilling the marshmallows before folding them in and allowing the buttery mixture to cool slightly makes all the difference in keeping their shape and chewiness intact.

What’s the best way to cut the squares neatly?

Use a sharp knife and consider warming the blade under hot water, then drying it before slicing. This helps cut through the sticky squares cleanly without tearing or smushing.

Final Thoughts

There is something truly special about a treat that is simple to make yet immensely satisfying, and this Peanut Butter Marshmallow Squares Recipe is exactly that. It’s a wonderful way to bring joy with basic pantry ingredients that come together to create a snack bursting with color, flavor, and nostalgia. I encourage you to whip up a batch—it’s guaranteed to be a hit with friends, family, and especially yourself!