Chocolate-Frosted Peanut Butter Cookie Bars {Aka: School Lunch Peanut Butter Fingers}

You know, because we don’t have enough peanut butter on this site.  Or chocolate.  Or cookies.  I can almost guarantee once you make these for the first time you will become addicted and have to make them all the time.  Don’t say I didn’t warn you.  One of my favorite things about this recipe is that it makes a ton (they’re baked in a large sheet pan).  That can be both dangerous and helpful. Mostly helpful.  If I have to feed a crowd, this is my go-to.  They honestly are SO fast.  The dough comes together in about 5 minutes and they only bake for about 10.  And then you can feed a gazillion (okay slight exaggeration) people when you’re done and they will all love you. I originally got this recipe from two friends (thanks Carolyn and Alisa!) and it seems to be one of those recipes that just ‘goes around’.  Apparently this was a common treat in school lunches back in the day and I’m starting to feel majorly ripped off that all I got was soggy pizza.  If anyone knows the original source, I’d love to know, but it seems to just be traced back to either everyone’s grandma or everyone’s lunch ladies! Let us cook.

These start off like most good things do: with butter and sugar.

In goes yummy nummy peanut butter.  Smooth or chunkified, totally up to you.

Then some eggs

(and there’s some vanilla in there too)

Then toss in the dry ingredients

You should have a nice soft dough at this point; a little softer than a normal cookie dough.  Definitely take a big ol’ bite of that.

And then add some oats.

That’s it for the dough- just press it into a big rimmed cookie sheet.  (By the way, have I ever told you how much I love these pans??  They come with lids.  Brilliant.  Makes baking stuff like this and then storing or transporting sooo easy.  Love love love them.) I usually line mine with foil because I have a thing for covering pans in foil.  If I can avoid washing a pan, I’m all for it.  Pop that pan in the oven to bake- they only take about 10 minutes.

While those are in the oven, rinse out your bowl real quick and whip up the frosting.  Oh my gosh this frosting is so good.  It’s melty and buttery and chocolatey and so many other good words I can’t think of right now.

You’ll want to put the frosting on when the bars are still warm, and just after the frosting itself is done.  Otherwise it stiffens up and becomes hard to spread.

Mmmm…giant pan of soft cookie…

This next photo is borderline ridiculousness.  Dumping melted peanut butter on top of a giant peanut butter cookie and below a layer of ooey gooey chocolate frosting is completely unnecessary.  It’s also very delicious.

You can skip this step, or embrace it, depending on how wild you’re feeling that day.

Then pour on that frosting, or rather “plop” on the frosting.  Like I said, do it right after you make it and while the bars are still warm so it spreads on easily and doesn’t break your cookie.

Since I took forever taking pictures my frosting isn’t as smooth and glossy as it will look for you.  Yours will be beautiful, I promise.  I also picked up some of those peanuts from below.  It’s all good.

That’s all there is to it, well except for the eating part which is the most important.  Once the bars are cool, they are super soft cookie squares with chocolate that melts in your mouth.

You can also eat these slightly warm, and they’re amaaazing.  They’re so soft and the chocolate frosting is more like melted chocolate fudge so you’ll want to grab a fork.

These have so much flavor and richness that they also work great with a scoop of ice cream, and heck, throw some hot fudge on there too just for good measure.  In fact, this is how we eat them most often at our house.  Because a scoop of ice cream makes just about everything better.


  1. Yum! I have everything for it right now to make it. I consider it healthy since it has oats in it and peanuts are protein!

  2. When did you guys start OBB Our Best Picks? So fun!!! I just bought a couple of those pans from Gygi’s about two weeks ago!
    And, no, there are not enough recipes here for chocolate or peanut butter, and definitely not enough cookies.

    1. You know, it’s always been sort of hiding there! We’re trying to get it all finished up (as in, filled up with all of our fave things) and then we’ll point out that it’s actually there! lol

      1. I don’t think I can stop myself from clicking over there and getting that purdy turquoise immersion blender today 🙂

  3. I am a strong believer that you can never have too much peanut butter + chocolate, or cookies! And to have them all in one is just divine.

  4. My grandma used to make these…except instead of the frosting, she just threw some semisweet chocolate chips on top right when it came out of the oven. Once they melt, spread and eat! Probably not as tasty as the frosting recipe here…BUT, it works great to make this super quick/simple recipe even more so (plus less dishes)!

  5. These are A-MAZING! My recipe for these came from a Ward Cookbook, which gives credit to Stephanie Wilkey. But they taste just like the peanut butter bars that they used to serve us for school lunch. Whoever or wherever they came from they are super delicious!

  6. Mmmm!! I have hot fudge stuff in my pantry! This will be a must have treat for today! Anything to use Ice cream for in an excessive heat warning!! Thank you for sharing this.

  7. I remember these being served with our school lunches when I was a kid. I got my recipe from my Grandma, and it is very similar to yours. These are always a big hit & one of my most requested recipes!!!

  8. This exact recipe has been in my family for years.. It came from the school lunch lady in springville Utah along long time ago! We love it!

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