These four ingredient sweet and salty butterscotch peanut butter marshmallow squares come together in just minutes.

Made with mini marshmallows, creamy peanut butter, butterscotch chips and butter, these tasty little no bake treats are as much fun to make as they are to eat!

Get this incredible no bake butterscotch bars recipe for an indulgent treat that tastes like old-fashioned butterscotch candy.

A stack of butterscotch peanut butter marshmallow bars on a marble countertop.
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In my never-ending search to quench my sweet tooth cravings, I bring you another no bake treat! No bake desserts are always a hit because there’s just so little wait time!

It’s such a great feeling to pull together a few (in this case, only FOUR) ingredients to put together something delicious and fun. These butterscotch peanut butter marshmallow squares are perfectly sweet and salty – a satisfying way to indulge your craving for something yummy!

My girls love anything with marshmallows! It makes me wonder – do marshmallows make everything better? 

These quick and easy butterscotch squares are a simple concept that anyone can make. In fact, this is one of those treats that your kids will need very little help with in the kitchen. For my girls, there’s nothing better than the satisfaction of creating and eating something from scratch.

As they grow, they are getting more confident in the kitchen, and I’m so proud! Of course…what kid (or adult) can argue with the combination of peanut butter, butterscotch and marshmallows? Not this girl!

Get my favorite old-fashioned butterscotch sheet cake recipe for another butterscotch dessert you’re going to love!

A gold cake pan full of butterscotch marshmallow bars

Why You’ll Love these Peanut Butter Marshmallow Squares

  • Four Ingredients
  • So Easy
  • Kids can Make Them
  • No Oven Required

The combination of butterscotch and peanut butter creates a creamy, rich buttery flavor that is going to get your taste buds singing!

A gold cake pan full of butterscotch marshmallow bars

Ingredients and Substitutions

  • Peanut Butter – I used creamy because that’s what I had on hand. However, you can also use crunchy peanut butter for a little added texture and crunch.
  • Marshmallows – Mini sized marshmallows work best for this recipe.
  • Butterscotch Chips – Found in the baking section with chocolate chips and the like, butterscotch chips have a distinctive flavor all their own!
  • Butter – Salted or unsalted, your choice. I’m a fan of all things sweet and salty so I use salted butter in much of my baking.

Variations

  • Add cereal. These no bake butterscotch treats commonly have rice krispies cereal in them.
  • Use chocolate chips instead of butterscotch for an entirely different flavor.
  • Add a teaspoon of vanilla for more fragrance and flavor.
A butterscotch and marshmallow bar on a marble countertop.
Gold pan with parchment paper lining, butterscotch squares recipe inside and knife to the side.

Tools to Use

A gold cake pan full of butterscotch marshmallow bars

How to Make

For the full printable recipe, see the printable recipe card at the end of this post.

  1. Line your pan with parchment paper for easy removal of the butterscotch squares.
  2. Melt – Next, in a saucepan on your stove top, add peanut butter and butterscotch chips. Slowly melt over medium heat, stirring occasionally. You can also do this in the microwave in a medium microwave safe bowl. Melt with 30 second increments, stirring in between until completely melted.
  3. Pour into your baking pan. Allow melted mixture to cool slightly before folding in the marshmallows.
  4. Set – Finally, after this no bake dessert has cooled completely, cut into squares and enjoy!
A stack of butterscotch peanut butter marshmallow bars on a marble countertop.

Tips

  • Use creamy peanut butter (avoid natural as sometimes the oils don’t blend well).
  • Don’t add the marshmallows to the bars right after the liquid mixture comes off the stove – you’ll risk melting the marshmallows. Let it cool just a bit before adding them.
  • Refrigerate these bars to help them set faster.

Frequently Asked Questions

What’s the difference between caramel, toffee and butterscotch?

Butterscotch and caramel are often used interchangeably, but butterscotch is probably best differentiated by the absence of milk or cream.
Toffee is generally considered to be butterscotch that is cooked for longer to create a sticky, rich sweet sauce that pairs beautifully with all kinds of old-fashioned butterscotch candy or butterscotch squares.

Why aren’t my no bake bars hardening?

It could be a balance of temperatures. Try placing these no bake peanut butter marshmallow squares in the refrigerator to set up faster!

A butterscotch and marshmallow bar on a marble countertop.

Dietary Considerations

  • Gluten Free
  • Vegetarian

How to Store

  • Room Temperature – Serve at room temperature. These no bake treats can be stored in an airtight container for up to three days .
  • Refrigerator – Enjoy up to a week! Simply store refrigerated in an airtight container to maintain freshness.
  • Freezer – You can freeze these treats for up to three months in the freezer in an airtight container. Ideally, flash freeze these bars on a baking sheet before you store them in a freezer safe container, with parchment stacked between to prevent sticking.

What’s your favorite no bake dessert? As you can see, we love them all! I don’t think I’ve ever eaten a butterscotch dessert or butterscotch candy that I didn’t love.

A gold cake pan full of butterscotch marshmallow bars

More No Bake Inspiration

A stack of butterscotch peanut butter marshmallow bars on a marble countertop.
5 from 21 votes

No Bake Peanut Butter Marshmallow Squares

These four ingredient sweet and salty butterscotch peanut butter marshmallow squares come together in just minutes.
Prep: 8 minutes
Cook: 0 minutes
Refrigerate: 1 hour
Total: 1 hour 8 minutes
Servings: 16
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Ingredients  

  • ½ cup butter salted
  • ¾ cup peanut butter creamy (not natural)
  • 2 cups butterscotch chips (11 ounce bag)
  • 4 cups miniature marshmallows

Instructions 

  • Line a 8×8 baking pan.
  • In a saucepan over medium heat combine butter, peanut butter and butterscotch chips stirring frequently.
    Alternatively combine in a bowl and microwave in 30 second increments, reducing to 15 second increments until melted and combined stirring between.
  • Allow to cool 5 minutes.
  • Fold in miniature marshmallows and pour into lined pan.
  • Refrigerate 1+ hours before cutting into squares and serving.

Julie’s Tips

Tips

  • Add in peanuts or candy coated chocolates like M&M’s, Peanut Butter M&M’s, or Reese’s Pieces.
  • Use creamy peanut butter (avoid natural as sometimes the oils don’t blend well).
  • Don’t add the marshmallows to the bars right after the liquid mixture comes off the stove – you’ll risk melting the marshmallows. Let it cool just a bit before adding them.
  • Refrigerate these bars to help them set faster.
Calories: 245kcal | Carbohydrates: 32g | Protein: 3g | Fat: 13g | Saturated Fat: 5g | Cholesterol: 17mg | Sodium: 199mg | Potassium: 78mg | Fiber: 1g | Sugar: 25g | Vitamin A: 199IU | Calcium: 8mg | Iron: 1mg

Estimated nutrition information is provided as a courtesy and is not guaranteed.

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14 Comments

    1. Hello Marguerite,
      You can safely store these at room temperature for 3-4 days.
      I hope that helps – enjoy!
      Julie