There’s something utterly delightful about the combination of peanut butter and marshmallows that sparks joy in every bite. When I first made these Peanut Butter Marshmallow Squares, I was looking for a quick treat that would satisfy both my sweet tooth and my craving for that nostalgic crunch. The moment that buttery, nutty aroma filled my kitchen, I knew I was onto something special.

Picture this: a simple melting process where creamy peanut butter meets the sweet allure of butterscotch, only to be transformed by pops of color from rainbow marshmallows. This easy recipe comes together in a matter of minutes, making it the perfect antidote to the fast-paced world of pre-packaged snacks. Whether you’re preparing for a gathering, surprising the kids after school, or simply treating yourself, these squares promise flavor and nostalgia in every bite. So, roll up your sleeves and let’s whip up a batch of joy!

Why is Peanut Butter Marshmallow Squares a must-try?

Simplicity at its finest: You only need a few pantry staples to whip up this delicious treat.
Creamy, dreamy flavor: The rich combination of peanut butter and butterscotch creates a luscious taste that’s hard to resist.
Colorful and fun: With rainbow marshmallows, these squares are not just a delight for your taste buds but also a feast for the eyes!
Perfect for every occasion: Whether it’s a snack for the kids, a party treat, or a sweet indulgence for yourself, these squares fit the bill.
Quick and easy: You can make these in minutes, saving you time to enjoy what matters most—family, friends, and fun!

Peanut Butter Marshmallow Squares Ingredients

For the Base

Unsalted butter – Gives a rich, creamy texture that enhances the overall flavor.
Peanut butter – A must-have for that delightful nutty richness; use creamy for smooth squares or crunchy for added texture.
Butterscotch chips – Provides a sweet, caramel-like flavor that pairs beautifully with peanut butter.

For the Mix-ins

Rainbow marshmallows – Adds a fun, colorful twist and chewy texture, making these Peanut Butter Marshmallow Squares visually appealing and enjoyable.

How to Make Peanut Butter Marshmallow Squares

Melt In a saucepan over low heat, combine the unsalted butter and peanut butter. Stir gently until both are fully melted and smooth, creating a rich base that will hold everything together.
Stir Once melted, incorporate the butterscotch chips into the peanut butter mixture. Keep stirring until the chips are completely melted and the mixture is well combined, reaching a delightful creamy consistency.
Fold Off the heat, gently fold in the rainbow marshmallows. Ensure they are evenly distributed throughout the mixture, adding color and a fun chewy texture to your delicious squares.
Pour Transfer the mixture into a greased pan. With a spatula or your hands, press the mixture down evenly to ensure a compact and tidy finish, making it easier to cut later.
Cool Allow your Peanut Butter Marshmallow Squares to cool completely at room temperature. This crucial step ensures they set up perfectly for cutting into delightful squares of joy.

Optional: Try adding a sprinkle of sea salt on top for an extra flavor boost!
Exact quantities are listed in the recipe card below.

Make Ahead Options

These Peanut Butter Marshmallow Squares are perfect for busy home cooks looking to save time! You can prepare the base mixture (butter, peanut butter, and butterscotch) up to 24 hours in advance. Simply melt and combine the ingredients, allow the mixture to cool slightly, then store it in an airtight container in the refrigerator. When you’re ready to finish your squares, fold in the rainbow marshmallows, pour the mixture into a greased pan, and let it cool completely at room temperature. This way, you’ll have delicious, homemade treats ready to enjoy, just as scrumptious as if made fresh!

Variations & Substitutions for Peanut Butter Marshmallow Squares

Feel free to explore and add your personal touch to this delightful recipe!

Nut-Free: Substitute peanut butter with sunflower seed butter for a nut-free option that still delivers on rich flavor. You won’t miss the peanuts at all!
Chocolate Lovers: Swap butterscotch chips with chocolate chips for a decadent twist that elevates each square to a chocolate lover’s dream. The combination of chocolate and peanut butter is simply divine.
Vegan: Use vegan butter and plant-based peanut butter alongside dairy-free butterscotch chips to create a deliciously vegan-friendly version. Enjoy guilt-free indulgence!
Texture Boost: Add chopped nuts like almonds or walnuts for a delightful crunch that complements the soft marshmallows beautifully. Texture can elevate your treats and keep things exciting.
Dried Fruits: Toss in some dried cranberries or raisins for a burst of tangy sweetness that contrasts beautifully with the creamy base. It’s a fantastic way to add a touch of health!
Spicy Kick: Sprinkle in a pinch of cayenne pepper or chili powder for a sweet and spicy flavor explosion that will surprise your taste buds. This twist is sure to be a crowd-pleaser!
Lower Sugar: Reduce the number of butterscotch chips and substitute some with oats. This adjustment keeps the sweetness while adding fiber for a healthier treat.
Coconut Twist: Incorporate shredded coconut into the mix for a tropical flair that pairs wonderfully with peanut butter and marshmallows. It’s like a mini vacation in every bite!

What to Serve with Peanut Butter Marshmallow Squares?

Imagine a delightful spread of flavors and textures to elevate your sweet treat experience.

Cold Milk: The classic pairing with peanut butter squares; it balances out the sweetness and enhances the creamy texture.
Vanilla Ice Cream: A scoop of creamy vanilla ice cream perfectly complements the rich flavors, adding a chilled contrast that everyone loves.
Fruit Salad: Fresh, tangy fruit adds brightness to every bite, cutting through the sweetness and bringing a refreshing crunch.
Chocolate Sauce: Drizzle warm chocolate sauce over the squares for a decadent twist, creating a luscious dessert that’s irresistible.
Coffee: A cup of coffee brings a touch of bitterness that contrasts beautifully with the sweet, buttery squares and makes for a cozy pairing.
Nutty Granola: Crumble some nutty granola alongside your squares for an unexpected crunch; it adds texture and complements the peanut butter flavor.
Chai Tea: Warm spiced chai enhances the sweetness of the treats with its aromatic profiles, making it a comforting afternoon delight.

Feel free to mix and match these pairings for a truly memorable experience!

How to Store and Freeze Peanut Butter Marshmallow Squares

Room Temperature: Keep your squares in an airtight container at room temperature for up to 3 days for optimal freshness and taste.

Fridge: For extended shelf life, store the squares in the fridge where they can last up to a week. Ensure they’re in an airtight container to maintain that delightful texture.

Freezer: For longer storage, freeze your Peanut Butter Marshmallow Squares. Wrap them in plastic wrap, then in foil, and they can last up to 3 months.

Reheating: To enjoy a soft treat again, let them thaw at room temperature. If you prefer them warm, microwave for a few seconds—but be careful not to overheat!

Tips for the Best Peanut Butter Marshmallow Squares

• Use Natural Peanut Butter: Opt for natural peanut butter for a healthier choice; it will give the squares a more authentic and rich flavor.

• Watch the Heat: Melt your ingredients over low heat to avoid burning. High heat can lead to a gritty texture instead of that smooth, creamy mixture we adore.

• Press Firmly: When you pour the mixture into the greased pan, press it down firmly. This helps your Peanut Butter Marshmallow Squares hold their shape after cooling.

• Customize Your Mix: Feel free to swap in your favorite add-ins, like chocolate chips or nuts, to keep things exciting and personalized for every batch!

• Cool Completely: Allow your squares to cool fully before cutting them; this prevents them from becoming too gooey and ensures clean edges when sliced.

Peanut Butter Marshmallow Squares Recipe FAQs

How do I choose the best peanut butter for my Peanut Butter Marshmallow Squares?
Absolutely! I recommend using natural peanut butter for a healthier and more authentic flavor. Look for options with just peanuts and salt on the label. This will give your squares a delightfully rich and creamy texture.

Can I store these squares at room temperature?
Very! You can keep your Peanut Butter Marshmallow Squares in an airtight container at room temperature for up to 3 days. This will maintain their freshness, but if you want to extend their shelf life, consider refrigerating them.

How do I freeze Peanut Butter Marshmallow Squares?
Here’s how to freeze them step-by-step! First, wrap each square individually in plastic wrap to prevent freezer burn. Then, place the wrapped squares in a zip-top freezer bag or an airtight container. They can be stored in the freezer for up to 3 months. When you’re ready to enjoy, let them thaw at room temperature for a few hours. If you prefer them warm, you can give them a quick zap in the microwave for a few seconds!

What should I do if my mixture is too gooey after cooling?
No worries! If your Peanut Butter Marshmallow Squares come out too gooey, it might be because they weren’t pressed down firmly enough or didn’t cool for long enough. To remedy this, place them in the fridge for a bit which can help them firm up. If they’re still not setting, consider adding a few extra marshmallows or butterscotch chips when you make them next to help balance the texture.

Are these squares safe for my dog?
It’s crucial to note that while peanut butter can be safe in small amounts, it should be unsweetened and have no xylitol, as this sweetener is toxic to dogs. The butterscotch chips and marshmallows are also high in sugar and should be avoided to keep your furry friend healthy. Enjoy these squares yourself and keep your pup’s treats to dedicated dog-friendly snacks instead!