Ultimate Chocolate Chip Cookie n’ Peanut Butter Oreo Fudge Brownie Bar

by Erin

Why choose when you can have cookies, Oreos, and brownies all in one with these chocolate chip cookie and peanut butter Oreo fudge brownie bars?

Ultimate Chocolate Chip Cookie n' Peanut Butter Oreo Fudge Brownie Bar

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Last night I didn’t work out. Figured a break from the sweat sessions was deserved since I rarely miss a day no matter how little sleep I’ve had (which has been very little these days). It’s funny though, how I (try to) eat healthier on the days I work out, but it’s quite the contrary when I don’t. A break from the gym means eating a huge brownie covered in ice cream… right?

Chocolate Chip Cookie and Peanut Butter Oreo Fudge Brownie Bar

But I didn’t just want any fattening ice cream on top, I wanted the absolute king of fatty ice creams – Ben & Jerry’s! Clusterfluff ice cream to be exact (peanut butter ice cream, marshmallow fluff swirls, caramel cashew pieces, and more peanut butter swirled in). I didn’t think that any other ice cream would be good enough to put on top of this salivary-gland-exciting cookie brownie bar (second choice was cookies and cream for obvious reasons).

Chocolate Chip Cookie Oreo Fudge Brownie Bar

I added peanut butter Oreos instead of double-stuffed as in the original recipe, which ended up in a massively long name, but it deserves it. I also adjusted the cookie dough recipe to use my favorite chewy chocolate chip cookies instead. It was so gooey and rich, and I got to eat it warm out of the oven so it made the ice cream all melty. I think I gained weight before it even hit my lips. Oh good lord I want more. Please join me in this sugar/fat coma.

Post updated 7/24/22, photo above is the original.

Ultimate Chocolate Chip Cookie n' Peanut Butter Oreo Fudge Brownie Bar


Yield: 2 dozen Prep Time: Cooking Time:
Nutrition facts: 200 calories 20 grams fat


  • 1 cup (2 sticks) butter, melted and cooled
  • 1 cup packed brown sugar
  • 1/2 cup granulated sugar
  • 1 egg + 1 egg yolk
  • 1 Tbsp vanilla extract
  • 2-1/4 cups flour
  • 1 tsp baking soda
  • 1 tsp salt
  • 2 cups (12 oz.) semisweet chocolate chips
  • 1 pkg peanut butter Oreos
  • 1 Family Size (9×13) Brownie mix (and ingredients listed on box)
  • 1/4 cup hot fudge topping (optional)


  1. Preheat oven to 350 degrees. Lightly coat a 9x13-inch pan with nonstick spray and set aside.
  2. In a large bowl, cream the butter and both sugars with an electric mixer on medium speed for 3-5 minutes, until light and fluffy. Add the eggs and vanilla and mix well to thoroughly combine.
  3. In a separate bowl, whisk together the flour, baking soda, and salt. Slowly incorporate into the mixer until the flour is just combined. Stir in chocolate chips.
  4. Spread the cookie dough in the bottom of the prepared baking dish. Top with a single layer of Oreos.
  5. In the same large bowl, mix together brownie mix and directed ingredients, adding an optional 1/4 cup of hot fudge topping to the mix. Pour the brownie batter over the cookie dough and Oreos. Bake for 40-50 minutes.
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Source: Adapted from Kevin & Amanda and My Favorite Chewy Chocolate Chip Cookies.

Did you make this recipe? I want to see! Tag @THESPIFFYCOOKIE on Instagram and hashtag it #THESPIFFYCOOKIE

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Food Snots October 4, 2011 - 2:46 pm

Oh my Yumminess!! This looks to die for!

spiffycookie October 4, 2011 - 2:49 pm

Quite literally ;-)

Tracey October 2, 2011 - 3:38 pm

I was always the opposite – anytime I went to the gym I found a way to justify lots of sweets. I think your brownie would definitely do the trick :) I’ve never had the Clusterfluff ice cream but oh my word does it sound good. Need to find!

Carrie- Clever Mommas October 1, 2011 - 4:40 pm

I love brownies, oreos, peanut butter… and Ice cream to boot!!! YUMMY!

Cassie (Bake Your Day) October 1, 2011 - 3:59 pm

This has to be the best brownie ever! They combine everything I love. Delicious, Erin!

Elina (Russian Bites) October 1, 2011 - 8:40 am

Haha, I am actually naturally less hungry on days I work out so I don’t even try to eat healthier, I do. On the days I don’t though – all hell breaks loose. This brownie is totally perfect for that kind of day! ;)

Naina @ chow bella October 1, 2011 - 6:04 am

Oh my goodness I think I gained weight from reading this post. I’m not sorry. When the day comes that I feel immune to (or at least deserving of) massive amounts of calories, I’m making this.

Michelle September 30, 2011 - 11:10 pm

I am so making this tomorrow.

Kita September 30, 2011 - 8:20 pm

This is my kind of healthy ;) I totally eat like a fat kid after I work out (probably why the working out isn’t working out for me).

spiffycookie September 30, 2011 - 8:24 pm

Fat kids unite!

Melissa (MelissaLikesToEat) September 30, 2011 - 6:21 pm

Have I been living under a rock? I didn’t know there was Peanut Butter Oreos!!!

Kelly September 30, 2011 - 1:36 pm

Oh wow, this looks so sinfully delicious! What an amazing recipe, yum! :)

Tara @ Chip Chip Hooray September 30, 2011 - 1:14 pm

Oh. My.

I’m sorry, I think that I gained an inch on my hips just *looking* at that photo. Does that mean I don’t want to eat that whole thing right now? Heck no.

P.S. My boyfriend and I discovered Clusterfluff ice cream a few weeks ago and we are OBSESSED. It’s seriously the best of the B&J flavors I’ve ever had. Extra points.

spiffycookie September 30, 2011 - 1:17 pm

OMG I KNOW! That ice cream is heaven. If I hadn’t read the nutritional info I would’ve eaten the entire thing in one sitting. Dividing it between two days is a much better strategy O:-).

Erin @ Dinners, Dishes and Desserts September 30, 2011 - 12:31 pm

Yeah, these look amazing! I think I could finish off a pan pretty darn quick!

Jennifer @ Mother Thyme September 30, 2011 - 9:54 am

I am just in a sugar/fat coma looking at this. I am would love to dive in to this right now! Delicious!

Stephanie September 30, 2011 - 9:28 am

This looks heavenly!! I didn’t work out yesterday either!;) sometimes you just need a day off and this is the perfect way to celebrate a day off!


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