Butterscotch Marshmallow Bars

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Chewy Butterscotch Marshmallow Bars are everything delicious in one sweet little package! Loaded with brown sugar, butterscotch, chocolate chips, and marshmallow, it’s like a s’mores dessert!

Love easy bar recipes? Our M&M’s Cookie Bars are simple and loved by all. Or give this 7 Layer Bar recipe a try soon!

Stack of two butterscotch marshmallow bars on a white plate.

Why You’ll Love These Butterscotch Marshmallow Bars

Butterscotch is like the forgotten flavor. 

It’s so rich and delicious, but people always tend to choose chocolate, peanut butter, or lemon desserts over butterscotch.

But can I be honest here? I think butterscotch is my favorite of all flavors. Today’s Butterscotch Marshmallow Bars are a hidden gem of a dessert.

Here’s why you’ll love them:

  • Basically, think of these as a s’more with butterscotch flavor. The bars are sweet and gooey, but because they’re not all chocolate, they’re not too much.
  • You can serve and eat them at room temperature or cold. And when you eat these chilled out of the refrigerator? Whole new level of flavor!
  • These butterscotch marshmallow bars are easy to make. If you can manage marshmallow brownies or Mississippi mud cake (two other favorites that combine chocolate and marshmallow!), you can totally make butterscotch marshmallow bars.

Important Ingredient Notes

  • Unsalted butter – We’re making butterscotch marshmallow bars, after all, so butter is important! Using unsalted butter puts you in control of the flavor of the finished product.
  • Butterscotch chips – A little shortcut that keeps you from having to make butterscotch from scratch on the stovetop.
  • Light brown sugar – One of the differences between butterscotch and caramel is that butterscotch is made with brown sugar and caramel is made with white. Using brown sugar helps stay true to that butterscotch flavor.
  • Mini marshmallows – Make sure they’re soft and fresh. Stale marshmallows can ruin baked goods!
  • Semi-sweet chocolate morsels – Milk chocolate are also an option if you prefer.
Chewy butterscotch bars on silver plate with mini marshmallows.

How to Make Butterscotch Marshmallow Bars

Prepare: Preheat your oven to 350ºF and line a 13×9 baking dish with parchment paper.

Make the Butterscotch Mixture: In a microwave-safe bowl, melt the butterscotch morsels with the butter for 30 seconds. Stir, then heat an additional 30 seconds. Stir again and heat for 15 more seconds and continue until the mixture is smooth when stirred.

Make the Batter: In a large mixing bowl, combine the brown sugar, eggs, and vanilla extract. Mix in the melted butterscotch chips, flour, baking powder, and kosher salt, then fold in the marshmallows and chocolate chips.

Bake: Pour the batter into the prepared pan and bake for 18-22 minutes, or until golden brown. Cool completely.

Chill: Refrigerate the butterscotch marshmallow bars for at least one hour before cutting and serving.

Hand holding a butterscotch s'mores bar.

Tips and Tricks

  • Use parchment paper to keep these gooey butterscotch marshmallow bars from sticking to the pan. Don’t use foil or wax paper—the bars will stick to them!
  • These bars taste best when chilled, but they can be stored in an airtight container at room temperature if you prefer.
  • You can freeze these bars by wrapping them in plastic wrap, then sliding them into a freezer safe ziploc or airtight container. Freeze for up to 3 months.
  • For a different spin on this recipe, swap out the butterscotch morsels for peanut butter morsels. You’re welcome!
  • When cutting butterscotch marshmallow bars, it can help to coat the knife in nonstick spray so the bars don’t stick. You might have to re-coat it once or twice.
Stack of butterscotch marshmallow bars on silver plate with bowl of mini marshmallows.

More Butterscotch Desserts

  • These are what you get when butterscotch meets Snickerdoodle. Chewy on the inside, crunchy on the outside, these Butterscotch Cookies only get better with time! You’ll love the sugar coating!
  • No Bake Haystack Cookies are just the thing to satisfy your intense sweet tooth cravings. It’s the ideal recipe for little hands to help, too. It’s packed with butterscotch flavor!
  • Creamy, melt in your mouth Butterscotch Fudge is an easy recipe to make any time of year! This fudge requires NO candy thermometer!
  • Chewy and sweet, these Butterscotch Revel Bars are a wonderful dessert to make for your next potluck, bake sale or party. They are also a great treat to bake and freeze for school lunches!
  • Thick and delicious, these chewy brown sugar Butterscotch Blondies are the perfect dessert!

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Butterscotch Marshmallow Bars

4.50 from 10 votes
By: Aimee
Chewy, sweet Butterscotch Marshmallow Bars. Packed with brown sugar, butterscotch, chocolate chips and marshmallow, it’s like a s’mores dessert!
Prep Time: 10 minutes
Cook Time: 22 minutes
Total Time: 32 minutes
Servings: 24 bars


  • ½ cup unsalted butter
  • 1 cup butterscotch chips
  • cup light brown sugar packed
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 1 ½ cups all-purpose flour
  • 2 teaspoons baking powder
  • ½ teaspoon kosher salt
  • 2 cups mini marshmallows
  • 1 cup semi-sweet chocolate morsels
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  • Preheat oven to 350 degrees. Line a 13×9 baking dish with parchment paper.
  • In small bowl, melt butterscotch chips with butter in microwave, at 30 second increments, stirring between each time. Set aside.
  • In large mixing bowl, add brown sugar, eggs, and vanilla. Mix in melted butterscotch chips, flour, baking powder and salt. Fold in marshmallows and chocolate chips. Pour batter into baking dish.
  • Bake for 18-22 minutes. Cool, cut into squares and refrigerate for one hour. Enjoy!


  • Parchment Paper. Definitely use it. It will keep these gooey, sticky bars from sticking to the pan. Don’t accidentally use foil or wax paper, won’t have the same results.
  • Storage. These bars taste best when chilled, but can be stored in airtight container at room temperature.
  • Freeze. You can freeze these bars by wrapping in plastic wrap then sliding into freezer safe ziploc or airtight container. Freee for up to 3 months.
  • Substitutions. Swap out the butterscotch morsels for peanut butter morsels. You’re welcome!


Serving: 1bar, Calories: 179kcal, Carbohydrates: 24g, Protein: 2g, Fat: 9g, Saturated Fat: 6g, Polyunsaturated Fat: 3g, Cholesterol: 27mg, Sodium: 111mg, Fiber: 1g, Sugar: 16g
Course: Brownies and Bars
Cuisine: American
Did you make this recipe?Mention @shugarysweets or tag #shugarysweets!

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About Aimee

Aimee is a dessert lover (specifically rice krispie treats), workout enthusiast, self-taught foodie, and recipe creator.

Learn more about Aimee.

Affiliate Disclosure:**There may be affiliate links in this post! By clicking on them, or purchasing recommended items I may receive a small compensation. However, I only recommend products I love! Thank you for supporting Shugary Sweets! See my disclosure policy for more info**

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Posted on May 10, 2019

Comments & Reviews

  1. These look sooooooooooooo delicious!!
    I’d love to try these, but we don’t have here butterscotch chips
    Not fair as these look too good

  2. These look AMAZING!! Pinned the recipe to definitely try later!

    Stopping by from Mix It Up Monday!

  3. Oh my sweetness! These look beautiful and delicious…Thanks so much for sharing at Mix it up Monday!

  4. I am totally ok with eating the whole pan myself and thats what I plan on doing this weekend!!

  5. Giiiiirl, you be speakin’ my language! How about we make it even more sinful with an avalanche-style scoop of vanilla ice cream on top? Drizzle on some caramel…

    I’ll stop now.

  6. I’m with you! PJ Mondays and dessert sound great. Especially with these bars! OMG I’m in love. 🙂

  7. Oh my sugar coma. Those do look fantastic. I don’t even like chocolate, but I think I could put away the tray. Wow.

  8. I make almost exactly the same thing… except I use way more butterscotch and chocolate chips:)
    They are gooey and delicious and you’re right, highly addictive!
    Btw, your picture is perfect!!!

  9. Oh my goodness..I think my husband will die if he finds me growling at him while eatting a whole pan of these in p.j.’s, drinking a giant glass of milk! I am so going to have to do this! Have a fantastic week!

  10. wow. Just wow!

    I love butterscotch, hugely! Just posted bars with them in it and with choc chips, AND I love marshmallows, too.

    These are perfect!

4.50 from 10 votes (10 ratings without comment)

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