Peanut Butter Marshmallow Fudge Brownies
Fudgy brownies + crunchy PB + marshmallow fudge frosting = the best brownies on the planet. You should definitely make these peanut butter marshmallow fudge brownies ASAP!
Well, last week, I gave you the best, and maybe only, side dish recipe you’ll need this summer. I can’t believe all of you who made it in the last week and reported back here and on Instagram already. You guys are the best. Seriously.
Today, I’m going to do you another solid and give you the only dessert recipe you’re going to need this summer. Trust me. Neighborhood BBQs, church potlucks, Thursday afternoon coping skills. There is no event or reason wherein these peanut butter marshmallow fudge brownies would not be acceptable.
Also, I couldn’t decide when to tell you this, but here goes: these brownies are shockingly good chilled (or frozen). Like, dangerously so. If your love language (and/or downfall) is peanut butter + chocolate, you’re either going to really love me or really hate me today.
What is marshmallow fudge frosting?
Gosh, I’m glad you asked. There’s truly nothing I want to talk about more right now than marshmallow fudge frosting. Gloriously shiny. Just a little teeny bit chewy. Unapologetically chocolate. Marshmallow fudge frosting is everything.
Plus, it’s one of those melt-your-own-frostings where everything is, yep you guessed it, melted on the stove until smooth and perfect. No electric mixers. No whipping butter. No clouds of powdered sugar clogging your sinuses. Nope, none of that.
The marshmallow fudge frosting is just what the decadent brownies and crunchy peanut butter need to be a complete dessert.
Let’s Talk Brownies
Although this recipe is made up of three layers, it’s super easy. (Not just saying that, promise.)
Start with a 9X13-inch pan of your favorite baked brownies. I’ve included my favorite one-bowl brownies in the recipe below, because they are AMAZING. But if you like your brownie recipe more than you like my brownie recipe, go ahead and use that. I promise, we can still be friends (I just won’t eat your brownies). Haha. Joking. Kind of. 🙂
The middle layer is one ingredient. Crunchy peanut butter. That’s it. If you’ve read my blog for any length of time, you know I’m one of the last people to encourage using nuts in brownies of any kind, but these rich brownies definitely benefit from the salty crunch of the tiny peanuts, and the creamy peanut butter acts a no-recipe frosting. Score.
After the marshmallow fudge frosting is spread on top, these little brownies benefit from a quick chill session in the refrigerator. I’ve given tips for cutting even squares in the recipe notes below (spoiler alert: dip sharp knife in hot water, wipe clean, slice, repeat), and like I mentioned in the opening act up there, these peanut butter marshmallow fudge brownies are unreal chilled. Or frozen.
I just can’t say enough good things about these brownies. They are a peanut butter and chocolate lover’s dream, and the salty, sweet, crunchy, fudgy, chewy combo is ridiculous (in a good way).
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Brownie: you can substitute your favorite 9X13-inch brownie recipe for the base brownie layer if you'd like. Cocoa: using Dutch-process cocoa in the frosting will yield a darker/richer frosting. As an Amazon Associate and member of other affiliate programs, I earn from qualifying purchases.Peanut Butter Marshmallow Fudge Brownies
Ingredients
Brownies (or use your favorite brownie recipe):
Peanut Butter Layer:
Marshmallow Fudge Layer:
Instructions
Notes
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Wow these are great. I used box mix () and they were very fun to make. Very rich so most of us ate half of one and that satisfied our cravings Thanks again Mel
These look delish! Would you suggest adding some powdered sugar to the PB  if I’m using a natural (sugar free) peanut butter?  Thx!
Probably, that might help!
So amazingly, wonderfully, good. We took one look at it and said ‘Oh, dear’! IT WAS SO DELICIOUS! Thanks, Mel!
Thank you!
 I was a little bit leery about trying this recipe because I thought the  marshmallow frosting looked very messy but I can’t resist peanut butter and chocolate.  Oh my goodness! They are one of the most amazing treats ever. I keep dreaming about getting another out of the freezer and they weren’t terribly messy like I feared.  I used Ghirardelli brownie mix. Hope we can still be friends.
Haha. Yes, still friends! 🙂
I can’t get the recipe photo to transfer to Pinterest
Hi Linda, I’m afraid I don’t know what you mean. Are you unable to save this recipe to Pinterest?
These were amazing! Â At first glance I brushed the recipe off, but then decided to make them. Â So simple, so yummy and tasted like much more work was put into them! Â I even took the easy route and used a Pillsbury brownie mix! Â Yum! Â
Thanks, Sarah!
I have made these twice in three days and they have been a hit. The first time I ran out of cocoa powder so for the frosting I omitted the half the butter and added semi sweet chocolate chips. The frosting was more fudge like and delicious. I preferred the less running and more fudge like frosting. I also put it on before the peanut butter was cooled and swirled it together. Amazing browniesÂ
I know this sounds absolutely crazy- but can I leave out the peanut butter layer? My son hates peanut butter :0. Thanks!
They’ll be really rich without the PB layer to offset the sweetness, but I’m sure you could try it!
These are SO good and basically melt in your mouth!
Glad you loved them, Becky!
Mel, I can’t get the link to work for your one pot/one skillet meals. I’m staying in a long term hotel until we are able to close on our house. I only have a stove top, no oven!! I was happy to see you have links to your skillet meal, but disappointed they led to an error message. Any help would be great. A month of only stovetop meals is leaving me completely clueless!!!
Here you go:
https://www.melskitchencafe.com/recipes/main-dish/one-potone-skillet-meals/
These look delicious!Â
I have been making something like this with a Pb layer for years (it’s one of my signature desserts to take everywhere), I use a chocolate ganache on top, I can’t wait to try the marshmallow fudge frosting. Thanks!Â
Day 1 of Whole 30 and you post this. . . Ugh. I want to throw in the towel now and run to the kitchen to make these. I think I’ll put them on the calendar for Day 31. They look amazing!
Hang in there! You can do it!
Hi, these look delicious. Can I use marshmallow fluff? Instead of marshmallows?
I haven’t tried that so I’m not sure…sorry about that!
I used marshmallow fluff and the frosting did not set up. Every time I cut a square the frosting slowly slid down into the dish. No problem, I scooped it up and put it on my piece, waste not want not! Very yummy, thank you for posting this.
I already have miniature marshmallows. Â How many/much would I need to use in place of the 10 large ones?
Ok, I’m making these now and I only have miniature marshmallows this time…so I’m using 2.75-3 ounces (which is about 130-140 miniature marshmallows or 1 1/4-1 1/2 cups). Does that help?
Could I use mini marshmallows (what I have in the cupboard) and how much do you think would equal the 10 large marshmallows? These look amazing!
Ok, I’m making these now (ahem, again) and I only have miniature marshmallows this time…so I’m using 2.75-3 ounces (which is about 130-140 miniature marshmallows or 1 1/4-1 1/2 cups). Does that help?
Yes, thanks!
Would you recommend natural
Peanut butter or just a normal
Peanut butter like Jif?
All I have is natural and I know sometimes it doesn’t do as well in baking.Â
I haven’t tried natural, but I definitely think regular ol’ Jif or Skippy is going to do better here.
Mel, these look amazing, but on your brownie instructions you don’t list a oven temp, and how do you prep the pan? Thanks!!!
Hey Jen, sorry about that. I just added those details to the recipe (the brownies are from this one-bowl recipe and I didn’t copy over that part on accident):Â https://www.melskitchencafe.com/one-bowl-extra-fudgy-brownies/
I want to make these for a wedding reception. First, Do you have a good 11×17 pan brownie recipe?? Second, if YOU were doing a brownie wedding reception dessert, which of your different variations in your archives would you make? I need at least 3-4 different 11×17 sheet pans. Help?!
Hi Andrea, I have this sheet pan brownie recipe:Â https://www.melskitchencafe.com/sheet-pan-fudgy-chocolate-brownies/
But be aware that some readers have said their brownies overflowed (if at high altitude). I don’t live at high altitude so I haven’t had that issue, but I wouldn’t want you to encounter that if making them for a wedding (or anytime!).Â
This is another sheet pan brownie recipe (so delicious and would be yummy in a brownie lineup):Â https://www.melskitchencafe.com/mississippi-mud-bars/
Most of the other 9X13-inch brownie recipes on my site could be 1 1/2’d for a half sheet pan (11X17). Any of these would be delicious!
https://www.melskitchencafe.com/cream-cheese-cheesecake-brownies/
https://www.melskitchencafe.com/chocolate-frosted-brownies/
https://www.melskitchencafe.com/killer-crunch-brownies-sugar-rush-7/
Andrea-
Mel’s Little Lemonies are phenomenal and they would be lovely at a wedding!Â