Marshmallow Peanut Butter Squares Recipe
Introduction
These Marshmallow Peanut Butter Squares are a delightful no-bake treat combining creamy peanut butter, sweet butterscotch, and fruity mini marshmallows. They’re easy to make and perfect for satisfying your sweet tooth with a chewy, rich texture.

Ingredients
- ½ cup unsalted butter
- 1 cup creamy peanut butter (Peter Pan brand recommended)
- 11 ounces butterscotch chips (Nestle Toll House brand recommended)
- 1 teaspoon vanilla extract
- 10 ounces fruity-flavored mini marshmallows (Jet-Puffed brand recommended)
Instructions
- Step 1: Line an 8×8 inch straight-sided baking pan with parchment paper, leaving an overhang on the sides. Lightly spray the parchment with non-stick baking spray to help remove the squares later.
- Step 2: In a 3½ to 4-quart saucepan over medium-low heat, combine the unsalted butter, creamy peanut butter, and butterscotch chips. Stir continuously until everything is melted and the mixture is smooth.
- Step 3: Stir in the vanilla extract. Remove the pan from heat and let the mixture cool for 2 to 3 minutes to prevent the marshmallows from melting when added.
- Step 4: Place the mini marshmallows into a large mixing bowl. Pour the slightly cooled peanut butter mixture over the marshmallows and gently fold to coat all the marshmallows evenly.
- Step 5: Transfer the combined mixture to the prepared pan and spread it into an even layer.
- Step 6: Chill the pan in the refrigerator for 1½ to 2 hours, or until the squares are completely firm.
- Step 7: Use the parchment paper overhang to lift the peanut butter bars out of the pan and place them on a large cutting board.
- Step 8: Slice into 16 squares using a large sharp knife. For smooth cuts, run the knife under hot water and wipe clean between slices.
Tips & Variations
- For a crunchier texture, try adding chopped nuts like peanuts or almonds to the mix before chilling.
- If you prefer chocolate flavor, substitute half of the butterscotch chips with semisweet chocolate chips.
- Use a combination of mini marshmallows for a colorful and fruity twist, or stick to plain white ones for a classic look.
Storage
Store the Marshmallow Peanut Butter Squares in an airtight container in the refrigerator for up to one week. Let them sit at room temperature for a few minutes before serving if they become too firm. These bars can also be frozen for up to one month; thaw in the refrigerator before slicing.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I use crunchy peanut butter instead of creamy?
Yes, crunchy peanut butter will add a bit of extra texture to the squares, which some people enjoy. Just note the mixture may be slightly less smooth.
What if I don’t have butterscotch chips?
You can substitute butterscotch chips with white chocolate chips or caramel chips for a different but still delicious flavor profile. Adjust sweetness according to your taste.
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Marshmallow Peanut Butter Squares Recipe
- Total Time: 2 hours 20 minutes
- Yield: 16 squares 1x
Description
These Marshmallow Peanut Butter Squares are a no-bake, chewy treat combining creamy peanut butter, sweet butterscotch chips, and colorful fruity mini marshmallows. Easy to prepare and perfect for snack time or dessert, these squares offer a delightful mix of flavors and textures with minimal effort.
Ingredients
Wet Ingredients
- ½ cup unsalted butter
- 1 cup creamy peanut butter (Peter Pan brand recommended)
- 1 teaspoon vanilla extract
Dry Ingredients
- 11 ounces butterscotch chips (Nestle Toll House brand recommended)
- 10 ounces fruity-flavored mini marshmallows (Jet-Puffed brand recommended)
Instructions
- Prepare the Pan: Line an 8×8 inch straight-sided baking pan with parchment paper, ensuring there is enough overhang on the sides to easily lift the bars out later. Lightly spray the parchment paper with non-stick baker’s spray to prevent sticking.
- Melt Ingredients: In a 3½ to 4 quart saucepan over medium-low heat, combine the unsalted butter, creamy peanut butter, and butterscotch chips. Stir continuously until all are melted and the mixture is smooth and well combined.
- Add Vanilla and Cool: Stir in the vanilla extract, then remove the saucepan from heat. Allow the mixture to cool for 2 to 3 minutes; this step ensures the mini marshmallows won’t fully melt when added.
- Combine with Marshmallows: Place the mini marshmallows in a large mixing bowl. Pour the slightly cooled peanut butter mixture over the marshmallows, and gently fold everything together until all the marshmallows are evenly coated.
- Transfer to Pan: Pour the combined mixture into the prepared baking pan and spread it evenly using a spatula or the back of a spoon.
- Chill: Refrigerate the mixture for 1½ to 2 hours or until the squares are completely firm and set.
- Remove Bars: Once chilled, carefully lift the peanut butter bars out of the pan using the overhanging parchment paper and place them onto a large cutting board.
- Slice into Squares: Using a large sharp knife, slice the bars into 16 equal squares. For smooth cuts, you can run the knife under hot water and wipe it clean between slices.
Notes
- Be sure to allow the peanut butter mixture to cool slightly before adding marshmallows to prevent them from melting completely.
- Use parchment paper with overhang to easily remove the bars without breaking them.
- Running the knife under hot water before slicing helps achieve cleaner cuts.
- Store leftovers in an airtight container in the refrigerator to keep firm.
- Optional: Substitute butterscotch chips with white chocolate chips for a different flavor variation.
- Prep Time: 10 minutes
- Cook Time: 10 minutes
- Category: Dessert
- Method: Stovetop
- Cuisine: American
Keywords: Marshmallow Peanut Butter Squares, no bake dessert, peanut butter treats, butterscotch, mini marshmallows, easy dessert

