I have yet to try the Joanna Gaines -- Southern Living -- Lucy's recipe for Magnolia Brownies, but it's on my list. The marshmallow frosting is intriguing! But I do have a list of favorite Peanut Butter Brownies! The first and second both start with brownie mix and the last two are scratch. So let's get started.
#1. The Duncan Hines Extreme Peanut Butter Brownie recipe is super easy and very good. To be honest, I didn't expect doctored brownie mix peanut butter brownies to be that great, but these were surprisingly awesome. At one point the recipe was on the Duncan Hines USA site, but now I can only find it on Canada's site.
#2. I will never get tired of these Marshmallow Krispie Topped Brownies. They're a little over-the-top, but that's fine by me.

#3. No surprise here given the source. Dorie Greenspan's Peanut Butter Fudge Brownie are excellent scratch peanut butter topped chocolate brownies.

And then there's this one which I haven't made in a while but is very tasty, Peanut Butter Marble Brownies. These are different because the base is actually a peanut butter brownie with a chocolate marble section baked in, and a chocolate ganache swirled through the peanut butter topping.

There are a lot more where these came from, but the ones on the list were the first to come to mind. If you're still on the hunt, check the side bar.
jess☆ @ Multicultural Melbourne
Peanut butter + chocolate = best combination ever. Thank you for yet another brilliant idea for this!!!
Mackenzie@The Caramel Cookie
I love brownies with peanut butter! YUM!
Martha in KS
I have yet to bake a batch of brownies that are better than a Pillsbury mix. In fact, I just took a pan out of the oven, which I enhanced with walnuts & a creamy, chocolate icing. Mahvelous!
Katrina
A little yin and yang is always nice. 😉
I love those rice crispy ones--if you like pb/chocolate--it just gets better with crispies and mallow.
Erin
Nom nom nom nom those look so awesome!
Adam
In theory I don't have a problem with boxed products, but because I don't get to bake often I always like to do things from scratch 🙂 and we also don't always have the same products here :). Regardless, PB + Chocolate brownies will probably be making an appearance on my Thanksgiving menu, and my family will worship me afterwards :). Thanks for the idea :).
Oh and as Gloria pointed out, we enjoy when you ramble, hell if I'm not rambling I'm probably sleeping (though I have been known to talk in my sleep too :)).
Louise
In spite of usually doing only baked from scratch, I think I could eat the Duncan Hines brownie if there was ganache instead of their frosting on top. It's good enough for the Emmys, so it should be good enough for me. 🙂
Lisa Ernst
I agree with Josie -- this is killing me. 🙂 Brownies and peanut butter with a chocolate topping, is there anything better?
Josie
You are killing me. PB and chocolate is my weakness. My OB is going to shame me once I make these and devour the whole batch. This monthly weigh-in during pregnancy is really cramping my style!
Gloria
I enjoy your rambling..I do the same thing sometimes!... At least here you are among friends-when I used to ramble to my coworkers about baking related technical issues related to what I brought in for them to try, I would watch eyes become glassy and glazed over! I love chocolate and peanut butter together, but I haven't had a brownie with it yet. I'm more of a salty peanut butter with chocolate fan. I wonder if the brownies with taste okay if the peanut butter didn't have any sugar in it? As a matter of fact I think I may try it that way and find out! I hope the weather is better in California than it is here-we had frost last night!