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Peanut Butter Cookie Bars

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Thick, chewy, and so easy to make, these peanut butter cookie bars should be on every peanut butter lover’s baking list!

stack of peanut butter cookie bars in front of a bottle of milk

 

Ugh. You guys, I’m getting over a cold and I just don’t feel like doing anything right now. Including trying to write something eloquent about my love for peanut butter. And my love for cookies. And my love for easy desserts.

So please excuse today’s post. I don’t love it.

But I do love these peanut butter cookie bars! They’re so EASY to make—even when you’re hacking up a lung and OD-ing on Cepacol—and they’re chock full of peanut butter (and peanut butter cups!).

Why you’ll love these peanut butter cookie bars

  • Like I said above, they’re super easy to make
  • They use pantry staples so you probably won’t need to make a special grocery trip
  • They’re customizable!  Use roasted salted peanuts, chocolate chips, banana chips—whatever you want in place of the peanut butter cups

How to Make Peanut Butter Cookie Bars

photo collage for how to make peanut butter cookie bars part 1
Combine peanut butter, room temperature unsalted butter, and brown sugar in a large mixing bowl.

Baker’s tip: if your butter is cold (like, if it’s right out of the fridge), cut it into small chunks and it will come up to room temperature much faster. You’ll know the butter is ready to use when you can press it with your fingertip and it gives a bit but still holds its shape.

The butter needs to be at room temperature both so the ingredients mix properly and so the cookie bars bake evenly.

Cream the pb, butter, and sugar together with an electric mixer until light and fluffy, as shown in the first pic above. Beat in an egg, some whole milk, vanilla, baking soda, and salt until it’s well combined (like in the second pic above). Stop every now and then to scrape the bowl with a rubber spatula.

Beat in flour on low speed until it’s just combined—you don’t want to see large streaks of flour in the dough.

photo collage for how to make peanut butter cookie bars part 2

Use a rubber spatula to fold in chopped peanut butter cups (or another mix-in of your choosing). Press the dough into a foil-lined baking pan and bake about 20 minutes, until the edges of the bars are puffed and golden.

Cool the peanut butter cookie bars completely before slicing and serving.

And dessert is ready! I’d tell you these peanut butter cookie bars beg to be served alongside a glass of milk but that’s frowned upon when one has a cold right? So we’ll just say coffee. (That’s really my preferred beverage anyway.)

Make yourself a batch of cookie bars and a big ol’ cup of coffee today. You won’t be sorry!

More easy desserts (in case you’re hungry)
Chocolate Coconut Bars
Peanut Butter Cup Cheesecake Bars
Chocolate Caramel Bars

stack of peanut butter cookie bars with one bar in front of the stack

Did you make these peanut butter cookie bars?  Let me know what you think with a comment and a rating below! And post a pic over on Instagram too.  Tag @theitsybitsykitchen so I can see (and share!) your creations!

5 from 1 vote
stack of peanut butter cookie bars with one bar in front of the stack
Print
Peanut Butter Cookie Bars
Prep Time
15 mins
Cook Time
20 mins
Total Time
35 mins
 

Thick, chewy, and peanut buttery, these peanut butter cookie bars are pb-lover's dream!

Course: Dessert
Cuisine: American
Servings: 16
Author: Kelsie
Ingredients
  • 1/2 cup creamy peanut butter don’t use natural
  • 1/2 cup unsalted butter at room temperature*
  • 1 cup packed light brown sugar
  • 1 large egg
  • 2 tablespoons whole milk
  • 1 teaspoon vanilla
  • 1/4 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1 1/2 cups all-purpose flour
  • 1 cup chopped peanut butter cups** optional
Instructions
  1. Preheat the oven to 350 degrees. Spray a 9-inch square baking pan with cooking spray. Line with foil, allowing several inches of excess to hang over the sides. Spray the foil with cooking spray and set pan aside.
  2. Cream the peanut butter, butter, and sugar together in a large mixing bowl with an electric mixer until light and fluffy. Beat in the egg, milk, vanilla, baking soda, and salt.
  3. Turn mixer to low and beat into the flour until just combined. Fold in the peanut butter cups with a rubber spatula
  4. Press into an even layer in the prepared pan and bake 20 to 25 minutes, until puffed and golden around the edges.
  5. Remove from the oven set pan on a wire rack to cool room temperature. Once the bars have cooled, use the foil to remove the bars from the pan, then slice and serve.
  6. Uneaten cookie bars can be stored in an airtight container at room temp for up to 2 days or in the freezer for up to 3 months.
Recipe Notes
  • *If your butter is cold, cut it into small chunks and it will come up to room temperature much faster. You’ll know the butter is ready to use when you can press it with your fingertip and it gives a bit but still holds its shape.
  • **If you don’t want to use peanut butter cups you can substitute chocolate chips, roasted salted peanuts, coarsely chopped banana chips, or whatever mix-ins you like.

Related

Comments

  1. Dana says

    April 17, 2019 at 2:48 pm

    5 stars
    I hear ya on the cold issue and hacking up a lung, that’s me right now! And I’d much rather be eating these than popping Cepocal like there’s no tomorrow. My cold started out as a sinus/ear infection early February, took a week to finally vacate and then I got the flu! (I haven’t had the flu since I was a wee tot) then my cold sorta came back and I’ve been pretty much congested since then…the cold just won’t end lol My nose has been running for the last month (post-drip so much fun) which has since caused laryngitis and I’ve been coughing for 3 days. Enough already! LOL We’ve had the longest winter ever, so that probably doesn’t help. It’s been sunny and warm the last day or so and I noticed my cold is getting better so I guess I just needed a dose of sun (instead of snow for once haha). I know this was last month, but hopefully your cold is better and didn’t linger like it seems to for so many people this year. I’m calling it the year the cold didn’t quit! 😀

    On a happier note, these PB cookie bars look amazing!! I think these might just help speed the healing…doesn’t hurt to try, right? haha Hope you’re doing great, chika! xo

    Reply
  2. Emma @ Bake Then Eat says

    April 8, 2019 at 12:46 pm

    I hope you are feeling better now. These cookie bars look so good, soft and chewy…yum!

    Reply
  3. Jo Thrasher says

    March 28, 2019 at 8:55 am

    5 stars
    Oh I’ve gotta make these, my husband will be ALL OVER THEM!

    Reply
  4. Shashi at SavorySpin says

    March 28, 2019 at 6:32 am

    5 stars
    Oh Kelsie – I hope you are doing much better now – I’m in awe that you whipped these up when you were ill – IMO these look like those Nutella bars – totally addicting… and totally worth of being made and remade… though having trouble with the sharing part 😉

    Reply
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About

photo of Kelsie Roehl     Hey there! I’m Kelsie and this is where I share my buttery, sugary, and all-around delicious recipes. I LOVE to bake and I want you to love baking too, so all of my recipes are totally do-able for the home baker.  If you need a little dessert in your life, consider this your one-stop shop for anything sweet! Need a little more info? Here you go!

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