Peanut Butter Marshmallow Squares are a classic dessert that’s both nostalgic and satisfying. This simple no-bake treat combines creamy peanut butter, butterscotch chips, and colorful marshmallows to create a dessert that’s as fun to make as it is to eat. Whether you’re looking for an easy snack to satisfy a sweet tooth or a delightful addition to your next gathering, these squares have you covered.
What makes Peanut Butter Marshmallow Squares so special is their perfect balance of flavors and textures. The creamy peanut butter and rich butterscotch chips blend together to create a sweet, salty base, while the marshmallows add a chewy, melt-in-your-mouth experience. It’s a dessert that feels like a blast from the past, one that might remind you of childhood treats and family gatherings.
The best part? They’re incredibly easy to make. No oven required! Just a few ingredients and some simple steps, and you’ll have a batch of these irresistible squares ready to go.

Why You’ll Love Peanut Butter Marshmallow Squares
• Quick and Easy: These squares require no baking, which makes them the perfect last-minute dessert or a fun activity to do with the kids. You’ll need only 10-15 minutes of prep time, plus a bit of chilling time to allow the squares to firm up.
• Minimal Ingredients: With just a handful of ingredients, you can whip up a batch of these squares in no time. They’re made with pantry staples, and you likely have most of them on hand already.
• Family-Friendly: Whether you’re baking with your kids or preparing a treat for a gathering, this recipe is an excellent choice. Everyone loves the sweet, chewy texture, and it’s easy enough for little hands to help with.
• Customizable: While the classic recipe is delicious on its own, you can easily customize it with other add-ins. Try using different types of chips, nuts, or even dried fruit for a unique twist. The possibilities are endless!
Key Ingredients in Peanut Butter Marshmallow Squares
Before we dive into the recipe, let’s go over the key ingredients that make these squares so delicious:
• Peanut Butter: You can use creamy or crunchy peanut butter depending on your preference. Creamy peanut butter provides a smooth texture, while crunchy peanut butter adds a bit of texture and bite. You can also opt for natural peanut butter if you prefer a healthier option.
• Butterscotch Chips: These chips are what give the squares their sweet, caramel-like flavor. If you’re looking for a healthier alternative, you can find sugar-free or even vegan butterscotch chips on the market. You can also substitute with chocolate chips for a different flavor profile.
• Butter: The butter helps bind the ingredients together and gives the squares their rich, smooth texture. For a dairy-free version, you can substitute with vegan butter or margarine.
• Marshmallows: Miniature rainbow marshmallows are the traditional choice for this recipe, but you can also use plain white marshmallows if you prefer. Freezing the marshmallows before mixing helps keep them from melting into the mixture.
• Vanilla Extract: Adds a lovely aromatic flavor to complement the other ingredients.
With these simple ingredients, you’re ready to create the ultimate batch of Peanut Butter Marshmallow Squares!

How to Make Peanut Butter Marshmallow Squares: The Step-by-Step Guide
Now, let’s get into the fun part! Making Peanut Butter Marshmallow Squares is a breeze, and you’ll be amazed at how quickly you can put them together. Follow these simple steps to create a dessert that will have everyone coming back for seconds.
Ingredients:
- 1 cup peanut butter (creamy or crunchy)
- 1 cup butterscotch chips
- 1/2 cup unsalted butter
- 1 package (250g) mini marshmallows (rainbow or plain)
- 1 tsp vanilla extract
Instructions:
- Prepare the Pan:
Start by lining an 8×8 or 9×9-inch square baking pan with parchment paper. This makes it easier to remove the squares once they’re set and ensures they don’t stick to the pan. - Melt the Ingredients:
In a medium saucepan, combine the peanut butter, butterscotch chips, and butter. Place the saucepan over medium-low heat. Stir the mixture frequently to avoid burning until everything is fully melted and smooth. - Cool the Mixture:
Remove the saucepan from the heat and allow the mixture to cool for a few minutes. This is an important step because you don’t want the marshmallows to melt when mixed in. Cooling the mixture a bit will prevent that from happening. - Fold in Marshmallows and Vanilla:
Once the mixture has cooled slightly, fold in the marshmallows and vanilla extract. Stir gently but quickly to ensure the marshmallows don’t melt completely. If you like, you can freeze the marshmallows for 10-15 minutes before adding them to keep them firm and chewy. - Transfer to the Pan:
Pour the peanut butter and marshmallow mixture into the prepared pan. Use a spatula to spread the mixture evenly in the pan. Be careful not to press down too hard, as the marshmallows need some space to stay fluffy. - Chill and Set:
Place the pan in the refrigerator and allow the squares to set for at least 1 hour. The mixture should firm up and be easy to cut into squares. - Slice and Serve:
Once the squares are firm and set, remove them from the refrigerator. Use the parchment paper to lift them out of the pan and transfer them to a cutting board. Slice into 16-20 squares, depending on how big you want your portions.
Pro Tip:
For an extra treat, serve these squares straight from the freezer. The peanut butter and marshmallow combo is even more amazing when it’s chilled, and they won’t get too soft. You can also store them in the freezer for a longer shelf life!

Variations and Customizations for Peanut Butter Marshmallow Squares
While the classic Peanut Butter Marshmallow Squares recipe is already delicious, there’s always room for creativity! You can easily adapt this recipe to suit your tastes or add a unique twist. Here are some fun ideas to consider:
1. Add Chocolate Chips or Chunks:
If you love the combination of peanut butter and chocolate, add some chocolate chips or chopped chocolate to the mix. You can use milk, dark, or even white chocolate chips for a rich, chocolatey twist.
2. Add Crunchy Elements:
Want a bit of crunch? Add Rice Krispies or chopped nuts, like peanuts or almonds, to the mixture for a satisfying bite. This will give your squares a nice texture contrast against the chewy marshmallows.
3. Use Different Types of Marshmallows:
Experiment with flavored marshmallows, such as strawberry or chocolate, to add a new layer of flavor to your squares. You could even use mini marshmallows with different colors for a fun, themed dessert.
4. Drizzle with Chocolate:
For an extra decadent touch, drizzle melted chocolate over the top of the squares once they’ve set. You can even sprinkle some sea salt on top to enhance the sweetness and add a sophisticated flavor profile.
5. Try Vegan or Gluten-Free Options:
For those with dietary restrictions, you can make these squares vegan by using dairy-free butter and peanut butter. You can also find gluten-free marshmallows and butterscotch chips to ensure that everyone can enjoy this treat.
Nutritional Breakdown of Peanut Butter Marshmallow Squares
These squares are undeniably delicious, but they are also packed with calories and sugar. Here’s a breakdown of the nutritional information for one serving (1 square):
Nutrient | Amount per square |
---|---|
Calories | 238 |
Total Fat | 15g |
Saturated Fat | 8g |
Trans Fat | 0g |
Unsaturated Fat | 6g |
Cholesterol | 12mg |
Sodium | 121mg |
Total Carbohydrates | 23g |
Dietary Fiber | 1g |
Sugars | 18g |
Protein | 3g |
As you can see, these bars are rich in fats and sugars, so they’re best enjoyed as an occasional treat rather than a daily snack. However, they’re a great option for satisfying your sweet cravings in a fun and delicious way!

Storing and Serving Peanut Butter Marshmallow Squares
These Peanut Butter Marshmallow Squares are perfect for making in advance and storing for later enjoyment. Whether you’re preparing for a party or simply want a snack to enjoy throughout the week, knowing how to properly store these squares can help keep them fresh and delicious. Here are a few tips on how to store and serve them:
Storage Tips:
- Refrigeration: After the squares have set, store them in an airtight container in the refrigerator for up to 1 week. Keeping them chilled helps maintain their texture, and they’ll stay fresh for several days.
- Freezing: If you want to store them for an extended period, these squares freeze beautifully. Wrap them in plastic wrap and then place them in a freezer-safe container or zip-lock bag. They can be frozen for up to 3 months. When you’re ready to enjoy them, simply thaw them in the refrigerator for an hour or let them sit at room temperature for 15-20 minutes.
- Serving Tips: These squares are delicious at room temperature, but they are especially enjoyable when served chilled or straight from the freezer. The peanut butter and marshmallow combo is incredibly satisfying when served cold, offering a refreshing texture that’s hard to beat.
Why Peanut Butter Marshmallow Squares are Perfect for Any Occasion
Peanut Butter Marshmallow Squares are not just easy to make—they’re also incredibly versatile. Whether you’re hosting a casual gathering or need a quick snack for the kids, these squares are a perfect choice. Here are some reasons why they should be your go-to treat:
Ideal for Potlucks and Gatherings:
These squares are ideal for potlucks, picnics, or any event where you need to bring a dessert to share. Since they’re so easy to make in large batches, you can quickly whip up enough to feed a crowd. Plus, they’re portable and don’t require refrigeration until after they’ve set, making them perfect for travel.
Great for Kids’ Parties:
Kids love the colorful marshmallows and the sweet, chewy texture of these squares. They’re also easy to cut into fun shapes, which adds to the excitement. Peanut Butter Marshmallow Squares are a great choice for birthday parties or any event where children are involved.
Quick and Easy to Make:
If you’re pressed for time but still want to make a homemade treat, these squares are the perfect solution. They require no baking, and with only a few ingredients, they can be made in under 30 minutes. After just an hour of chilling, they’re ready to serve!

Final Thoughts on Peanut Butter Marshmallow Squares
Peanut Butter Marshmallow Squares are a nostalgic and delicious treat that’s sure to please everyone. Whether you’re looking for a quick snack, a fun dessert for a party, or just a way to indulge in something sweet, this recipe is a winner. With their sweet and salty flavor, chewy texture, and easy preparation, these squares are the perfect balance of convenience and indulgence.
The best part is that you can customize them with your favorite ingredients, making them a versatile dessert that you’ll come back to time and time again. So next time you’re in the mood for something sweet, whip up a batch of Peanut Butter Marshmallow Squares—and watch them disappear in no time!

Peanut Butter Marshmallow Squares Recipe
Ingredients
Method
- Line an 8×8 or 9×9-inch square pan with parchment paper.
- In a medium saucepan, melt the peanut butter, butterscotch chips, and butter over medium-low heat, stirring until smooth. Remove from heat and let cool slightly.
- Once the mixture has cooled, fold in the marshmallows and vanilla extract. Stir gently but quickly to avoid melting the marshmallows completely.
- Pour the mixture into the prepared pan and spread it evenly using a spatula.
- Refrigerate for at least 1 hour, or until firm.
- Remove from the pan using the parchment paper, slice into squares, and serve.
Notes
- Freezing the marshmallows before adding them to the mixture will prevent them from melting into the peanut butter mixture.
- You can substitute butterscotch chips with chocolate chips if you prefer a chocolatey twist.
- For a crunchier texture, you can add Rice Krispies or chopped nuts like peanuts or almonds.
- Store leftovers in an airtight container in the fridge for up to 1 week, or freeze for up to 3 months.
Nutritional Facts (per square):
Nutrient | Amount per square |
---|---|
Calories | 238 |
Total Fat | 15g |
Saturated Fat | 8g |
Unsaturated Fat | 6g |
Cholesterol | 12mg |
Sodium | 121mg |
Total Carbohydrates | 23g |
Dietary Fiber | 1g |
Sugars | 18g |
Protein | 3g |