Picture this: a sunlit kitchen filled with the glorious aroma of warm peanut butter and sweet butterscotch melting together. The moment you stir in the fluffy mini marshmallows, they soften and create a dreamy, creamy texture that beckons you to dive in. Each square exudes a delightful nostalgia, reminiscent of carefree afternoons at home, where the simple pleasures of life brought joy in every bite. Whether it’s a cozy winter evening or a warm summer day, these Peanut Butter Marshmallow Squares are the perfect treat to brighten your spirits.

I remember the first time I made these squares with my grandmother. We would gather in her kitchen, blending our ingredients and chatting about everything under the sun while sampling spoonfuls of our creations. It was a magical experience that made every bite of her treats extra special. Now, as I whip up this recipe in my own kitchen, the lovely memories come rushing back. If you’re ready to create something irresistibly delicious and transportive, let’s make these Peanut Butter Marshmallow Squares together!
Table of Contents
Why You’ll Love This Recipe
- Simple & Quick: Ready in just 30 minutes, you’ll have a tasty treat without much fuss.
- Irresistible Flavor: The combination of creamy peanut butter and sweet butterscotch is utterly heavenly.
- Eye-Catching Appeal: These squares are not only delicious but visually stunning, topped with cute marshmallows.
- Flexible Serving: Perfect for snack time, parties, or just a sweet treat after dinner!
- Diet-Friendly Options: Easily adaptable for gluten-free diets with just a few swaps, making them accessible for everyone.

Ingredients You’ll Need
- 1/2 cup Butter, Softened: Use unsalted butter for a balanced flavor; it adds rich creaminess. If you’re short on butter, feel free to use coconut oil as a substitute for a hint of tropical taste.
- 1 cup Peanut Butter: Creamy peanut butter works best to ensure that silky smooth texture. Natural peanut butter is a great alternative if you prefer a healthier option, though the squares may be slightly less sweet.
- 2 (11 oz) bags Butterscotch Chips: These are the star of the show, offering a luscious sweetness that is hard to resist. You can switch to chocolate chips for a decadent twist.
- 1 (10 oz) bag Mini Marshmallows: They provide that chewy texture we all love. For a vegan alternative, look for plant-based marshmallows, which work perfectly in this recipe.
How to Make Peanut Butter Marshmallow Squares
Prepare the Pan: Start by lining a 9 x 9-inch pan with aluminum foil, allowing enough overhang for easy removal. Spray the foil generously with non-stick spray to ensure nothing sticks later. This simple step can save you a lot of hassle when you want to cut and serve those delicious squares!
Melt the Mixture: In a medium saucepan, add the softened butter, creamy peanut butter, and both bags of butterscotch chips. Place the pan over low heat and stir constantly. The goal here is to melt everything together until you have a smooth, velvety mixture. This might take around 5 to 8 minutes, so enjoy the sweet scents as they fill your kitchen!
Mix in Marshmallows: Once completely melted, remove the saucepan from the heat. Scoop out 1/2 cup of mini marshmallows and set them aside. Pour the remaining marshmallows into the warm peanut butter mixture and stir quickly. You just want to combine them gently to avoid melting too many marshmallows, which will give your squares that delightful chewy texture!
Spread and Press: Now it’s time to spread your mixture evenly into the prepared pan. Use a spatula to push the mixture into the corners and smooth the top. Sprinkle the reserved mini marshmallows over the surface and gently press them in. This step adds a cute touch and makes each square visually appealing!
Let it Harden: Allow the mixture to cool at room temperature. Depending on the climate, this could take about 30 minutes. If you’re in a hurry, you can pop the pan into the fridge to speed up the process. Once set, the mixture will be nice and firm, making it easy to cut into squares.

Storing & Reheating
These Peanut Butter Marshmallow Squares can be stored at room temperature in an airtight container for about 3 days. If you want to keep them fresh for a longer period, store them in the refrigerator for up to 1 week. For an even longer shelf life, freeze the squares for up to 3 months. Wrap them in plastic wrap and then place them in a freezer-safe container. When you’re ready to enjoy, let them thaw at room temperature for a few hours or pop them in the microwave for a brief 10–15 seconds to refresh that gooey texture!
Chef’s Helpful Tips
- Avoid overmixing when adding marshmallows; you want them partially intact for that perfect chewiness.
- If mixing becomes too tricky, try using a spatula instead of a wooden spoon. The spatula is easier to maneuver and folds flavors while maintaining texture.
- To enhance the flavor, consider adding a pinch of salt or a splash of vanilla extract—it elevates the overall taste!
- If you need a gluten-free version, double-check the butterscotch chips to ensure they don’t contain gluten ingredients.
These tips will help you create the perfect batch every time!
These Peanut Butter Marshmallow Squares are an incredibly delightful treat that combines ease with irresistible flavors. They bring back memories and create new ones, all while being wonderfully simple to make. So gather your ingredients, have a little fun in the kitchen, and enjoy each bite of soft, chewy goodness created just for you.
Recipe FAQs
Can I use a different type of nut butter?
Absolutely! Almond butter, cashew butter, or sunflower seed butter can be great alternatives. Just remember that each nut butter has its flavor profile, which will slightly change the taste of the squares.
What’s the best way to cut the squares?
Using a sharp knife works best. For neat cuts, try placing the squares in the refrigerator for about 30 minutes before slicing. This will firm them up and make cutting much easier.
Can I make these ahead of time?
Yes! These squares are perfect for make-ahead treats. Simply follow the instructions, allow them to set, and store them wrapped in an airtight container. They stay delicious for several days.
What if I don’t have butterscotch chips?
No worries! You can substitute with milk chocolate chips or semi-sweet chocolate chips for a different flavor profile. The sweet combinations will still be incredibly tasty!
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Recipe Card

Peanut Butter Marshmallow Squares
- Prep Time: 10 minutes
- Cook Time: 8 minutes
- Total Time: 18 minutes
- Yield: 16 squares 1x
- Category: Dessert
- Method: No-Bake
- Cuisine: American
Description
These Peanut Butter Marshmallow Squares are a quick, delicious treat combining creamy peanut butter, sweet butterscotch, and soft mini marshmallows. Perfect for any occasion!
Ingredients
- 1/2 cup Butter, Softened
- 1 cup Peanut Butter
- 2 (11 oz) bags Butterscotch Chips
- 1 (10 oz) bag Mini Marshmallows
Instructions
- Line a 9 x 9-inch pan with aluminum foil and spray generously with non-stick spray.
- Melt together softened butter, creamy peanut butter, and butterscotch chips in a saucepan over low heat until smooth.
- Set aside 1/2 cup of mini marshmallows and mix remaining marshmallows into the warm mixture gently.
- Spread the mixture evenly in the prepared pan and sprinkle reserved marshmallows on top, pressing slightly to adhere.
- Let the mixture cool at room temperature or refrigerate until set, about 30 minutes.
Notes
For a gluten-free option, check the butterscotch chips for gluten ingredients.
If using natural peanut butter, squares may be less sweet but more healthy.
To keep them fresh longer, refrigerate or freeze the squares.
Nutrition
- Serving Size: 1 square
- Calories: 150
- Sugar: 14g
- Sodium: 70mg
- Fat: 7g
- Saturated Fat: 3g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 20g
- Fiber: 1g
- Protein: 3g
- Cholesterol: 10mg



