Butterscotch Bars with Chocolate and Disappearing Marshmallows

Ahhhhh…these, my friends, are a real treat. Straight from my childhood, a pan of this irresistible goodness was a regular at our house. Mom was (and still is) no slouch in the baking department, and these Butterscotch Bars with Chocolate and Disappearing Marshmallows were always a favorite.

Truthfully, I’m not the biggest butterscotch fan, and rarely bake anything butterscotch-y. But every once in awhile I come across a dessert that makes me question why I don’t use the flavor more. I think the key for me is to not have an overwhelming amount of butterscotch. This recipe fits that thought process perfectly.

These bars are rich with a mixture of butterscotch and chocolate, and chewy from marshmallows you’ll never see again after the pan slides into the hot oven. Once baked, the marshmallows scattered throughout the batter melt into their surroundings, leaving little pockets of ooey gooey chewiness. Paired with a glass of cold milk, I think you’ll agree they’re about the most perfect butterscotch bar you’ll ever have the pleasure to meet.

Mom’s recipe was designed for a 9” square pan. But when I couldn’t find my 9” pans (maybe you heard me tweeting for help?!), I doubled all the ingredients and baked it in a 9” x 13” pan instead, which is what I’m sharing here. This recipe is so good, a smaller pan is just not enough anyway! 

And, yes, I did find my pans. After a couple hours of tearing my hair out, and the house apart. They were in our girls’ art cabinet, being used as trays for their stained glass window projects. It was kinda hard to stay angry after that find.

Kinda.  :wink:

Butterscotch Bars with Chocolate and Disappearing Marshmallows

Yield: 16 bars


  • 1 c. butterscotch chips
  • 1/2 c. unsalted butter
  • 1-1/2 c. all-purpose flour
  • 2/3 c. packed brown sugar
  • 2 tsp. baking powder
  • 1/2 tsp. salt
  • 1 tsp. pure vanilla extract
  • 2 large eggs
  • 2-1/2 c. mini marshmallows
  • 2 c. semi sweet chocolate chips


Preheat oven to 350°. Spray the bottom and sides of a 9'' x 13'' pan with cooking spray and set aside.

In a large sauce pan over medium low heat, melt the butterscotch chips and butter, stirring constantly. Remove from heat to cool.

In a medium bowl, whisk together the flour, brown sugar, baking powder, and salt.

Add vanilla and eggs to the butterscotch mixture and stir well. Then add the flour mixture and stir to combine. Fold in the marshmallows and chocolate chips, just until combined. Spread into prepared pan and bake for 20 to 25 minutes, taking care to not over bake. (I think they're best when just slightly under-baked!) The edges should be browned nicely, and the center not quite set. The bars will firm upon cooling.


from Mom's recipe box

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36 Responses to “Butterscotch Bars with Chocolate and Disappearing Marshmallows”

  1. #
    Maria — September 26, 2012 at 8:29 am

    I love making bar treats and these look fabulous!

  2. #
    natalie — September 26, 2012 at 9:11 am

    i need these.
    right now

    what is the baking time for an 8-inch square pan? i don’t trust myself with a 9 x 13 of these

    • Brenda replied on September 30th, 2012 at 9:20 pm

      Hi Natalie – For an 8″ pan, half the ingredients. I’m guessing about 20 minutes, but set your timer a little sooner than that to check on the doneness.

  3. #
    Laura (Tutti Dolci) — September 26, 2012 at 11:33 am

    What luscious looking bars!

  4. #
    Donna — September 26, 2012 at 11:50 am

    My family would love these bars! I need to go get some butterscotch chips though. These will go over big I am sure!

  5. #
    Cathy @ Noble Pig — September 26, 2012 at 12:07 pm

    So Fall-ish…I love it!! Love the disappearing marshmallows tagline!!

  6. #
    cassie — September 26, 2012 at 12:36 pm

    The marshmallows are so fun, Brenda! I love butterscotch, too!

  7. #
    Christina @ This Woman Cooks! — September 26, 2012 at 12:52 pm

    “Disappearing marshmallows-” that’s what caught my attention. I’m intrigued. :)

  8. #
    Jessalyn — September 26, 2012 at 1:14 pm

    I have made these bars many times and I love them! The “pockets of ooey gooey chewiness” are the best. Perfect! Love your blog.

  9. #
    Bobbie (aka Rebelle ) — September 26, 2012 at 1:41 pm

    I love your blog. It is beautiful! I love these too :) I will have to try them very soon! Thanks so much for such a wonderful recipe!

    • Brenda replied on September 30th, 2012 at 9:17 pm

      Thank you so much, Bobbie – so nice to meet you!

  10. #
    Paula — September 26, 2012 at 2:38 pm

    I’m glad you found your missing pans…what a lovely surprise when you did. The girls stained glass work is great.
    Your mom’s recipe is a keeper! Love the *disappearing* marshmallows. Like you, I’m not a big eater /baker of butterscotch recipes. Knowing this has the perfect balance of that flavour has enticed me to give them a try. Betcha I make them more than once ;)

  11. #
    Katrina @ Warm Vanilla Sugar — September 26, 2012 at 3:44 pm

    These sound so tasty! Love this idea :)

  12. #
    Becca - Cookie Jar Treats — September 26, 2012 at 4:09 pm

    Usually butterscotch overpowers anything that it’s in, at least for me, but I do love the flavor.

    I like the idea is disappearing marshmallows :) I like when marshmallows are so soft and gooey and then you take a bite of one and it stretches out. That’s the best :)

  13. #
    Kim — September 26, 2012 at 4:14 pm

    This recipe arrived at just the right time for this Kansas farm wife. I was looking to make a bar cookie to take to the guys working on planting the 2013 wheat crop. They are currently cooling on the kitchen counter, and I couldn’t resist trying a corner before it was cool. Yum! Thanks for sharing in time for the guys’ supper!

    • Brenda replied on September 30th, 2012 at 9:17 pm

      Yay! LOVE to hear this, thanks!! :)

  14. #
    Julia {The Roasted Root} — September 26, 2012 at 5:21 pm

    Treats from childhood are so fun to bake and bring a wonderful sense of comfort. Mom’s baking recipes are unparalleled! The butterscotch bars look tasty and the textures looks just perfect for my chewy, crispy sweet tooth.

  15. #
    Jessica@AKitchenAddiction — September 26, 2012 at 5:58 pm

    These are so fun! Love the melty marshmallows!

  16. #
    Shaina — September 27, 2012 at 9:25 am

    Mmm, butterscotch. That’s all I needed to hear.

  17. #
    Mercedes — September 27, 2012 at 10:41 am

    I think I could eat the whole pan of these bars! I love butterscotch and with chocolate and marshmallows?? What a combination!

  18. #
    Sommer@ASpicyPerspective — September 27, 2012 at 12:12 pm

    So homey and inviting. …My kids always use my tongs of science projects!!

  19. #
    Karyn - Pint Sized Baker — September 27, 2012 at 8:42 pm

    Yumm-o!! I could go for some of these tonight!

  20. #
    Amanda — September 28, 2012 at 7:45 am

    I love buttersctoch. Like LOVE IT. And even if it is not your favorite, I think we can still be friends. ;) This recipe sounds amazing!!! I cant help but laugh at where you pans were… my GOSH if that same thing is has not happened here!!!

  21. #
    Gina — September 28, 2012 at 6:28 pm

    Oh my – how I love butterscotch!!! YUM!

  22. #
    Deborah — September 28, 2012 at 10:10 pm

    Oh my goodness – I made some similar bars several years ago and loved them. I’ve actually been thinking about remaking them – now I really want to!

  23. #
    nest of posies — September 29, 2012 at 9:45 pm

    oh my word! these look sinful! ;)

  24. #
    Staci — September 30, 2012 at 7:46 pm

    Love these flavor combinations. I must add this to next weekend’s baking list. Yum!

  25. #
    master chef — October 1, 2012 at 2:33 am

    WOW, looks amazing :) Love your blog

  26. #
    raja — October 1, 2012 at 2:42 pm

    greetings, i was wondering how many marshmallows should i use if using large ones?

  27. #
    Aimee @ ShugarySweets — October 27, 2012 at 5:38 pm

    Mmmm, love bar treats!

  28. #
    Stefanie — January 27, 2014 at 11:22 am

    Just made these bars last night – RAVE reviews in our household and requests to make them again please. I love that they are your mom’s recipe. Thanks for sharing. I enjoy your blog so much and look forward to trying more of your recipes.

    • Brenda replied on January 28th, 2014 at 7:12 am

      You are so welcome, Stefanie – I’m so glad you like to visit me here, and that you loved one of my favorite bars recipes, too! Have a great day! :)

  29. #
    Danae — August 29, 2014 at 11:45 am

    I have been making these for years. Found the recipe in a school cookbook. They are great with peanut butter chips instead of the butterscotch. I agree with you about the butterscotch.


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