As I flipped through an old recipe book, a wave of nostalgia hit me hard when I stumbled upon the no-bake Peanut Butter Marshmallow Squares. These delightful treats whisk me back to summer afternoons spent with kids, indulging in sweet, chewy goodness. This recipe is a game-changer, allowing you to whip up a delightful dessert in just 15 minutes without ever turning on the oven. With the rich flavor of creamy peanut butter and the soft, fluffy texture of mini marshmallows, it’s hard to believe these are vegetarian-friendly! Whether you’re looking for a quick snack or a fun gift for a loved one, these squares are sure to impress. Ready to create a little magic in your kitchen? Let’s dive into the bliss of Peanut Butter Marshmallow Squares!

Why are Peanut Butter Marshmallow Squares a must-try?
Quick and Easy: These Peanut Butter Marshmallow Squares come together in just 15 minutes, making them perfect for busy days when you’re craving something sweet.
No-Bake Delight: No oven is needed! This no-bake recipe is ideal for hot days or when you want a hassle-free dessert without additional heat in the kitchen.
Chewy and Delicious: The combination of gooey marshmallows and creamy peanut butter brings a nostalgic joy that’ll satisfy both kids and adults alike.
Versatile Options: Feel free to swap in different chocolates or even try a Peanut Butter Bites variation for a fun twist on flavor.
Perfect for Any Occasion: Whether for a picnic, party, or simply as a treat at home, these squares will wow your friends and family every time!
Peanut Butter Marshmallow Squares Ingredients
• A delightful mix of textures and flavors await!
For the Squares
- Unsalted Butter – Provides richness and helps bind the ingredients; use coconut oil for a dairy-free version.
- Creamy Peanut Butter – Acts as the main flavor component, delivering a smooth and rich taste; chunky peanut butter can add texture but will affect the smoothness.
- Butterscotch Chips – Adds a sweet, creamy element and enhances flavor depth; swap for chocolate chips for a different taste experience.
- Vanilla Extract – Enhances overall flavor with warm notes; no direct substitution, but you can omit if needed.
- Mini Marshmallows – Provides chewy texture and sweetness that balances the flavors; flavored marshmallows can add a fun twist.
- Cooking Spray (for greasing the pan) – Prevents sticking, ensuring easy removal of squares; no alternate recommended.
Step‑by‑Step Instructions for Peanut Butter Marshmallow Squares
Step 1: Melt Butter
In a large saucepan, melt 1/4 cup of unsalted butter over low heat, stirring frequently. Keep an eye on it as it melts; you want it shiny and completely liquefied but not browned, taking about 3-5 minutes.
Step 2: Combine Ingredients
Once the butter has melted, add 1 cup of creamy peanut butter and 1 cup of butterscotch chips into the pan. Stir continuously for about 2-3 minutes until the mixture is smooth and lump-free, creating a deliciously creamy base for your Peanut Butter Marshmallow Squares.
Step 3: Incorporate Vanilla
Remove the pan from heat and immediately stir in 1 teaspoon of vanilla extract. This will enhance the flavor profile beautifully, mixing it well for about a minute until fully blended with your warm peanut butter mixture, creating an aromatic experience.
Step 4: Fold in Marshmallows
With the mixture off the heat, gently fold in 4 cups of mini marshmallows until they are evenly coated with the peanut butter mix. Take your time here; aim to keep the marshmallows intact while ensuring they’re fully immersed in the creamy goodness, which should take about 1-2 minutes.
Step 5: Transfer to Baking Dish
Prepare a greased 9×13 inch baking dish with cooking spray. Pour the mixture into the dish, using a spatula to press it down firmly and evenly distribute it. This helps form the squares and sets the stage for a perfectly shaped treat, a process that should take around 3-5 minutes.
Step 6: Set the Squares
Allow the squares to sit at room temperature for about 2 hours so they can firm up. If you’re short on time, you can refrigerate them for roughly 30-45 minutes. The goal is to have a nice firm texture without losing their chewiness, creating that delightful Peanut Butter Marshmallow consistency.
Step 7: Cut and Serve
Once set, use a sharp knife to cut the treat into approximately 1.5-inch squares. Serve these irresistible Peanut Butter Marshmallow Squares alongside a glass of cold milk or tea for a perfect pairing, making them an enjoyable snack for family and friends.

Peanut Butter Marshmallow Squares Variations
Feel free to put your own spin on these delightful squares and make them truly yours!
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Chocolate Twist: Swap butterscotch chips for chocolate or white chocolate chips. This classic twist will satisfy every chocolate lover’s cravings.
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Festive Fun: Add festive sprinkles or a drop of peppermint extract during mixing for a joyful touch during holidays or celebrations. Nothing brings smiles like a sprinkle of color!
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Nutty Alternative: Substitute almond butter for peanut butter to introduce a nutty flavor, keeping in mind allergy concerns for guests. It adds a fresh twist while staying delightful.
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Crispy Add-Ins: Fold in a cup of crispy rice cereal for added texture and a satisfying crunch. The contrast between chewy and crispy makes each bite an adventure!
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Flavored Marshmallows: Use different flavored marshmallows, like strawberry or chocolate, for a whimsical twist that adds a fun variety of tastes. You might discover a new favorite!
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Add Heat: Toss in a pinch of cayenne pepper for those who enjoy a subtle kick. It creates a surprising yet delightful contrast to the sweetness of the squares.
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Try Cookies: Crumble in some crushed cookies, such as Oreos or graham crackers, for a textural twist. It’s a fun way to experiment while maintaining that classic peanut butter flavor!
For more twists on treats, check out my delicious Peanut Butter Greek yogurt bites or explore the sweet world of Flour Peanut Butter cookies for more inspiration!
Make Ahead Options
These Peanut Butter Marshmallow Squares are perfect for meal prep enthusiasts! You can melt the butter and combine all ingredients up to 24 hours in advance to save time during busy weeks. Simply prepare the mixture until folding in the marshmallows, then store it in an airtight container in the refrigerator. When you’re ready to serve, gently reheat the mixture on low until it softens, fold in the marshmallows, transfer to a baking dish, and let the squares set for about 30-45 minutes in the fridge. This method ensures your squares remain just as delicious, with that delightful chewy texture! Enjoy the convenience of having these treats ready to go!
Expert Tips for Peanut Butter Marshmallow Squares
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Patience Matters: Take your time melting the butter. If heated too quickly, it can burn and ruin the smooth texture of your Peanut Butter Marshmallow Squares.
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Gentle Folding: When incorporating marshmallows, use a gentle hand. Over-mixing can break them apart, leading to a less satisfying chew.
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Setting Time: Allowing the squares to set longer enhances their chewy texture. Aim for at least 2 hours to achieve the perfect consistency.
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Cutting Technique: Use a sharp, warm knife to slice through your squares effortlessly. This prevents them from crumbling and keeps them looking beautiful.
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Storage Tips: Keep the squares in an airtight container at room temperature for up to a week, or refrigerate for extended freshness and enjoy them for days!
How to Store and Freeze Peanut Butter Marshmallow Squares
Room Temperature: Store your Peanut Butter Marshmallow Squares in an airtight container at room temperature for up to 1 week to maintain their chewy texture.
Refrigerator: For extended freshness, you can refrigerate the squares, which keeps them delicious for up to 2 weeks. Just ensure they are properly sealed to avoid absorbing any odors.
Freezer: Freeze the squares in an airtight container or tightly wrapped with plastic wrap for up to 2 months. Thaw them in the fridge overnight before enjoying!
Reheating: If you prefer a slightly gooey treat, pop them in the microwave for a few seconds to warm them up before serving—perfect for that just-made taste!
What to Serve with No-Bake Peanut Butter Marshmallow Squares
Indulging in sweet, chewy squares opens the door for delicious pairings that elevate your dessert experience.
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Cold Milk: A classic pairing, the creamy richness of milk complements the sweet and nutty flavors perfectly, balancing each bite.
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Fresh Berries: Juicy strawberries or raspberries add a refreshing contrast to the intense sweetness, enhancing the overall flavor harmony.
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Vanilla Ice Cream: The creaminess of vanilla ice cream creates a delightful temperature contrast while melting into the warm squares, enhancing their gooey texture.
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Chocolate Sauce: Drizzling warm chocolate sauce over the squares brings an extra layer of indulgence that chocolate lovers will adore.
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Chia Seed Pudding: The textural contrast between soft squares and creamy chia pudding offers a fun twist, while also adding a nutritious element to your dessert.
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Sparkling Lemonade: A zesty lemonade adds a refreshing and slightly tangy note that cuts through the sweetness, making each bite feel light and enjoyable.
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Coffee or Espresso: The rich, robust flavors of coffee or espresso serve as the perfect pick-me-up alongside these indulgent treats, creating an energizing balance.
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Coconut Whipped Cream: Light and airy, whipped coconut cream provides a gentle sweetness and tropical touch, enhancing the chewy, nutty goodness of the squares.
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Nutty Trail Mix: A handful of nutty trail mix adds crunch and robust flavors, offering a fun snacking option that pairs beautifully with the soft texture of the squares.

Peanut Butter Marshmallow Squares Recipe FAQs
What type of peanut butter works best for the squares?
I highly recommend using creamy peanut butter for a smooth texture, which helps blend easily with the other ingredients. If you prefer a bit of crunch, chunky peanut butter can also work, but be aware that it will change the final texture.
How should I store my Peanut Butter Marshmallow Squares?
Store your Peanut Butter Marshmallow Squares in an airtight container at room temperature for up to 1 week. If you’d like to keep them fresh for a bit longer, refrigerate them for up to 2 weeks. Make sure they are sealed properly to prevent absorbing odors.
Can I freeze Peanut Butter Marshmallow Squares?
Absolutely! You can freeze these delightful squares for up to 2 months. Just place them in an airtight container or wrap them tightly in plastic wrap. When you’re ready to enjoy, simply thaw them in the fridge overnight before serving. For a warm treat, microwave them for a few seconds.
What should I do if my squares are too sticky?
If you find that your Peanut Butter Marshmallow Squares are sticky, this could be due to the marshmallows being overly melted. To avoid this, be gentle when folding in the marshmallows and allow them to set for a full 2 hours at room temperature before cutting. If they’re already sticky, you can dust the squares lightly with powdered sugar to make them easier to handle!
Are there any allergy considerations I should be aware of?
Yes, keep in mind that this recipe contains peanuts and may not be suitable for those with peanut allergies. For a nut-free alternative, you can use sunflower seed butter instead of peanut butter. Additionally, check the labels of your butterscotch chips, as some may contain dairy.

Decadent Peanut Butter Marshmallow Squares in Just 15 Minutes
Ingredients
Equipment
Method
- In a large saucepan, melt 1/4 cup of unsalted butter over low heat, stirring frequently.
- Once melted, add 1 cup of creamy peanut butter and 1 cup of butterscotch chips into the pan. Stir continuously until smooth.
- Remove from heat and stir in 1 teaspoon of vanilla extract.
- Gently fold in 4 cups of mini marshmallows until they are evenly coated.
- Prepare a greased 9x13 inch baking dish. Pour the mixture into the dish and press down firmly.
- Allow the squares to sit at room temperature for about 2 hours to firm up.
- Once set, cut into 1.5-inch squares and serve.

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