What a Cluster Bars

What A Cluster Bars | Cookies and Cups

Hey you guyeeeees!

So this week…

We’re going there.  And there.  Annnnd there. It’s officially Ben and Jerry’s themed week!

You know Kristan and I love our themes…remember Brownie Batter Week?  Or Caramel Apple Week?  What about Valentine’s Week…and of course the most recent Candy Bar week (Bridget joined us on that one)?

And this week we’re going B&J.

We got this idea a while back after we both made Ben and Jerry’s treats in the same week without planning it (Late Night Snack Cookies and Peabody, Julie and Heather.

Each day Kristan and I are going to be joined by one (or two) of these girls to bring you a dessert dedicated to one of our favorite Ben and Jerry’s flavors.  Which I am going to say was basically impossible to narrow down.  I mean…

Ben and Jerry's Week!

So in the word’s of my Grandpa, “Let’s get this show on the road”.

I’m starting the week off with “What a Cluster”.  Don’t you just love the titles of their ice creams?

It’s a peanut butter ice cream with crunchy caramel clusters, and swirled with marshmallow and peanut butter.  This one was a total no brainer for me.  Hello peanut butter.

So what I decided on was What A Cluster Bars….

What A Cluster Bars | Cookies and Cups

What we have here is a peanut butter blondie base, filled with a layer of Marshmallow Fluff, topped with caramel krispies.

Yeah, they’re as good as they sound.

Start by making your peanut butter blondie…

I threw in some peanut butter chips for good measure.
A cup of peanut butter chips being added to a mixing bowlJust press it into your 9×9 and bake until the edges start to get golden.
Peanut butter blondie dough pressed into a baking panLet those cool completely and then spread a nice layer of Marshmallow Fluff all over the top…
Marshmallow fluff spread over peanut butter blondies in a panNext up make your krispie layer and add a little caramel.
Caramel sauce being added to melted marshmallow mixture in a saucepanDump that on top of the Fluff layer
Caramel rice krispie treat mixture being added to a pan of peanut butter blondies with marshmallow toppingAnd press it down evenly…
Caramel rice krispie treat layer being pressed over peanut butter blondie and marshmallow layers in a panThat’s it!

All the flavors of the yummy ice cream in one easy bar 🙂
What A Cluster Bars | Cookies and Cups

Now for the fun part!

Hop on over and see what Kristan did with Cherry Garcia (I hear there’s cake involved)

And check out Peabody’s Phish Food invention!  (I hear there’s PIE involved) My kids are gonna be all over that!


What a Cluster Bars

  • Author: Cookies & Cups


makes 20 squares



Blondie base

  • 7 Tbsp butter, melted
  • 1 cup light brown sugar
  • 1 egg + 1 yolk
  • 1 tsp vanilla
  • 1 cup flour
  • 1/2 tsp baking powder
  • 1 cup peanut butter chips


  • 1 cup Marshmallow Fluff

Krispie Topping

  • 2 Tbsp butter
  • 2 cups mini marshmallows
  • 1/4 cup caramel sauce
  • 3 cups krispie cereal


  1. Preheat oven to 350°
  2. Line a 9×9 pan with foil and spray with cooking spray.
  3. In bowl of stand mixer beat together melted butter, brown sugar, whole egg, yolk and vanilla until smooth.
  4. Turn speed to low and add in flour and baking powder until batter comes together and is combined. Fold in peanut butter chips.
  5. Press in to prepared pan and bake 20 minutes until edges just begin to golden.
  6. Allow to cool completely.
  7. When cool spread Marshmallow Fluff evenly on top of blondie.
  8. Prepare your krispies next in a medium sauce pan. Melt butter over low. Add in marshmallows, stirring until melted. Remove from heat and stir in caramel sauce.
  9. Next add krispie cereal and stir until coated.
  10. Pour krispie mixture onto Fluff layer and press evenly. Allow to krispie layer to cool for 15 minutes and cut into squares.

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Hi! I’m Shelly and I’m an addict. Of the buttercream sort. I started this site a few years ago as a way to justify my sugary, buttery obsession with desserts. It has worked out well for me so far, because as it turns out you guys all love sugary, buttery desserts too! It feels good to know you're not alone, doesn’t it?

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Tracie Anzaldi
Sep 3, 2016 2:02 pm

You mention that the blondie is a peanut butter blondie and your photo shows peanut butter, but there are only chips in the recipe…is that correct?

Feb 3, 2014 2:12 pm

I wanted to make these but only have Dark Brown Sugar on hand, is that ok? or do I need the light brown sugar?

Sep 5, 2013 1:12 pm

Salted caramel sauce will still taste okay, right?

Sep 5, 2013 1:18 pm
Reply to  stephanie

oh shoot…and how about doubling? 🙂 Thanks!

May 31, 2013 5:55 am

Oh my goodness! Never had the ice cream but now I must find it. These sound so delicious. Makes perfect sense to have these on hand since I feel like my life is a bit of a cluster now.

May 30, 2013 5:20 am

Yummy recipe. Actually looks so delicious. I will try to make it in tomorrow.

May 24, 2013 8:15 am

These look absolutely delicious. I would have never thought to combine good old rice crispie squares with blondies! Great bake sale idea too.

May 17, 2013 2:27 pm

thinking of these will keep me up at night, they look yummy!

May 16, 2013 10:41 am

Love the idea of Ben and Jerry’s week! These look so yummy!

May 16, 2013 10:32 am

What a great spin on Rice Crispy Treats! The look great!

May 15, 2013 9:54 am

These look incredible! How can you beat salty, sweet AND crunchy?! Yum!

May 15, 2013 12:15 am

Wow you packed these with all kinds of great flavors!

I love your theme weeks, and this is going to be one of my favorites! I love the flavor combos that B&J come up with. These bars look heavenly!

May 14, 2013 2:58 pm

oh my family would love these!! this would be great to whip up and serve our help when we move!!

May 14, 2013 10:46 am

What a fun idea to do Ben & Jerry’s ice cream flavours! and actually, I’d never heard of What a Cluster. They do come up with the best names…

May 14, 2013 2:32 am

a) Marry me?
b) These get to be at our wedding reception, right? And the after-party? And maybe the alter?
c) If neither b nor c…cater my wedding? LOVE these!

Shelly Hi! I’m Shelly and I’m an addict. Of the buttercream sort. I started this site a few years ago as a way to justify my sugary, buttery obsession with desserts. It has worked out well for me so far, because as it turns out you guys all love sugary, buttery desserts too! It feels good to know you're not alone, doesn’t it?

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