Toasted Marshmallow Peanut Butter Cake Bars

These Toasted Marshmallow Peanut Butter Cake Bars are chewy, sweet and packed with all kinds of peanut butter cookie goodness! They’re some of our favorite cookie bars ever!

yellow cake mix recipes

Marshmallow & Peanut Butter Cake Cookie Bars

Girl Scout Season is here! Yay for my taste buds but boo for my waistline because that means I am adding Girl Scout Cookies to everything including my new Toasted Marshmallow Peanut Butter Cake Bars. Let me paint the picture for you. Imagine sinking your teeth into an ultra chewy cake-y cookie like consistency-half way between a rice krispie treat and blondie. The toasted marshmallows mixed right into the dough give the best texture and not to mention rich taste.

Try my Thin Mint Double Chocolate Chip Cookies too! Follow Picky Palate on Instagram for daily recipe inspiration.

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Here’s your ingredients. Nice and simple.

yellow cake mix recipes

How to Roast Marshmallows in The Oven

  1. Preheat oven to 400 degrees F. then back to 350 for bars and line 2 large baking sheets with a silpat liner or parchment paper. I used the half sheet size.
  2. Place marshmallows into the center of your baking sheet and bake for about 10 minutes until nice and golden on the tops and puffed. Remove and reduce oven’s temperature to 350.

yellow cake mix recipes

How To Make Peanut Butter Cake Bars

  1. Preheat oven to 350 degrees F. Place cake mix, butter, oil, egg, chocolate chips and quartered Tagalongs into a large mixing bowl. Stir to combine. Stir in toasted marshmallows, only stir to combine gently, you don’t want to mix too much. Transfer dough to prepared baking sheet and press evenly, don’t spread to edges, just within the border is fine.
  2. Bake for 18-22 minutes, until baked through. Remove and let cook for 30 minutes before slicing into squares. Serve and Enjoy!

yellow cake mix recipes

Add your egg, a little oil and of course the peanut butter!

yellow cake mix recipes

Time to add the toasted marshmallows. Be prepared, it’s a sticky delicious mess. Just scoop it up the best you can with a spoon.

yellow cake mix recipes

 Add it right to your bowl.

yellow cake mix recipes

Give a gentle stir.

yellow cake mix recipes

 Girl Scout Cookies! I used the peanut butter patties aka Tagalongs.

yellow cake mix recipes

Quarter those babies and add them right to the bowl.

yellow cake mix recipes

Oh yah!

yellow cake mix recipes

Transfer to your prepared baking sheet and press evenly.

yellow cake mix recipes

 Bake and get ready to nom nom nom 🙂

yellow cake mix recipes

Perfect little chewy squares.

yellow cake mix recipes

Careful these babies go fast.

yellow cake mix recipes

Image of Toasted Marshmallow Peanut Butter Cake Bars

Toasted Marshmallow Peanut Butter Cake Bars

These Toasted Marshmallow Peanut Butter Cake Bars are chewy, sweet and packed with all kinds of peanut butter cookie goodness! They're some of our favorite cookie bars ever!
Course: Dessert
Cuisine: American
Prep Time 10 mins
Cook Time 22 mins
Total Time 32 mins
Servings: 16 bars
Calories: 357kcal
Author: Jenny
Cost: 8
Print Pin Rate

Equipment

  • Oven

Ingredients

  • 6 Jumbo marshmallows
  • 1 box yellow cake mix
  • 1 stick/1/2 cup unsalted softened butter
  • 2 tablespoons vegetable or canola oil
  • 1 large egg
  • 1/2 cup creamy peanut butter
  • 1 1/2 cups chocolate chips I used mini
  • 10 Girl Scout Tagalongs quartered (peanut butter patties)

Instructions

  • Preheat oven to 400 degrees then back to 350 for bars and line 2 large baking sheets with a silpat liner or parchment paper. I used the half sheet size.
  • Place marshmallows into the center of your baking sheet and bake for about 10 minutes until nice and golden on the tops and puffed. Remove and reduce oven’s temperature to 350.
  • Place cake mix, butter, oil, egg, chocolate chips and quartered Tagalongs into a large mixing bowl. Stir to combine. Stir in toasted marshmallows, only stir to combine gently, you don’t want to mix too much. Transfer dough to prepared baking sheet and press evenly, don’t spread to edges, just within the border is fine. Bake for 18-22 minutes, until baked through. Remove and let cook for 30 minutes before slicing into squares. Serve and Enjoy!

Notes

You can substitute chopped Reese's Peanut Butter Cups in place of the Tagalong Cookies if desired.

Nutrition

Calories: 357kcal | Carbohydrates: 54g | Protein: 6g | Fat: 14g | Saturated Fat: 5g | Cholesterol: 14mg | Sodium: 333mg | Potassium: 108mg | Fiber: 2g | Sugar: 36g | Vitamin A: 59IU | Vitamin C: 1mg | Calcium: 101mg | Iron: 1mg
Keywords: cake bars, cake mix cookie bars, cookie bars, cookie bars recipe, peanut butter bars recipe, peanut butter cookie bars, smores bars recipe

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44 Responses
  1. Maggie

    Since I’ve already consumed the Tagalongs I bought this season, I found a perfect substitute…Walmart’s Great Value brand has a peanut butter patty cookie that is just the same as the GS tagalong….but $1.50 a package 🙂 There’s a Thin Mint version as well….perfect for after GS cookie time is over, so we can make these yummy bars all year!

  2. Hi, Neat post. There is a problem with your site in internet explorer, would check this?IE still is the market leader and a huge portion of people will miss your fantastic writing due to this problem.

  3. Helen

    Hi there. I’m not too crazy about peanut butter, what can I substitute for it? Replaced it with butter? Thank you so much in advance.

  4. Tracy

    HI Jenny,
    Just FYI- your written directions differ from your step by step pictures. The written steps say to add the marshmallows last, after the chocolate chips and cookies. But your pictures has it the other way around. I noticed that as making and didn’t think it would make a difference, but adding hot marshmallows to chocolate chips MELTS them. Did not turn out as nicely pictured as your:(

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Picky PalateWelcome to my online kitchen! You'll usually find me with a cookie in one hand & a salad in the other. It's all about the balance :) The recipes you'll see are my creations. Enjoy!

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