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 butterscotch s’mores dessert!
These are a hidden gem on my website. I’m obsessed with butterscotch and these bars are a delight, especially served cold.
These butterscotch marshmallow bars were originally published in April 2012. The recipe was updated with new photos and recipe tips in January 2025. Same great recipe!
Aimee’s Recipe Notes
- Taste: Sweet and buttery with rich butterscotch flavor and marshmallow.
- Texture: Chewy and gooey.
- Ease to Make: Quick and simple one bowl mixing.
- Top Tip: Use fresh marshmallows for best flavor and texture!
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.
- Think of these as a s’more with butterscotch flavor.
- 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.
Featured Review
“I have made these 3 times in the last two weeks, they usually last 1 day and there are only 3 of us.” -Jennifer S.
Today’s recipe uses mostly pantry staples. Add in some fresh butter and eggs and you have a delicious treat!
- 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 – The main flavor in these bars.
- 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.
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.
- 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.
Assemble and Bake:
- Fold in the fresh mini-marshmallows and chocolate chips.
- 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.
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.
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!
- 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.
- Thick and delicious, these chewy brown sugar Butterscotch Blondies are the perfect dessert!
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Butterscotch Marshmallow Bars Recipe
Chewy, sweet Butterscotch Marshmallow Bars. Packed with brown sugar, butterscotch, chocolate chips and marshmallow, it's like a s'mores dessert!
Ingredients
- ½ cup unsalted butter
- 1 cup butterscotch chips
- ⅔ 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
Instructions
- 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!
Notes
- 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!
- See blog post for more recipe tips and tricks.
Nutrition
Serving: 1bar, Calories: 179kcal, Carbohydrates: 24g, Protein: 2g, Fat: 9g, Saturated Fat: 6g, Polyunsaturated Fat: 3g, Cholesterol: 27mg, Sodium: 111mg, Fiber: 1g, Sugar: 16g
Did you make this recipe?Mention @shugarysweets or tag #shugarysweets!
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
These look AMAZING!! Pinned the recipe to definitely try later!
Stopping by from Mix It Up Monday!
Oh my sweetness! These look beautiful and delicious…Thanks so much for sharing at Mix it up Monday!
Your pictures are always stunning!
I am totally ok with eating the whole pan myself and thats what I plan on doing this weekend!!
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Oh! My! Word!!!!
These are dangerous because I think I have everything to make them already.
These bars look absolutely AMAZING!!!!! YUM!!! What a great recipe, thanks for sharing these!!!!
Mondays and dessert just go hand in hand!! Now if only I had one of these yummy bars in each hand:-)
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.
these look so good!! i love how ooey and gooey the filling is with the marshmallows..yum!
I’m with you! PJ Mondays and dessert sound great. Especially with these bars! OMG I’m in love. 🙂
Oh my sugar coma. Those do look fantastic. I don’t even like chocolate, but I think I could put away the tray. Wow.
I agree; all Mondays should involve dessert! These bars look absolutely perfect!
Butterscotch and marshmallow….glorious!!! 😀
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!!!
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!
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!
Oh Good Lord! And I happen to have all the ingredients….