Peanut Butter Chocolate Chunk Bars

Recipe By Tessa Arias
July 25th, 2018
Filed Under: Bar Dessert | Chocolate | Dessert
4.62 from 18 votes
4.62 from 18 votes

Peanut Butter Chocolate Chunk Bars are ultra thick, chewy, gooey, and loaded with tons of sweet peanut butter and chocolate flavor!  Download my free cookie customization guide HERE

Yield: 9 large or 16 small bars

Prep Time: 15 minutes

Cook: 30 minutes

Tessa's Recipe Rundown...

Taste: The nutty peanut butter coupled with the semisweet chocolate chunks is just the perfect flavor combination!
Texture: The bars are perfectly thick and chewy with a generous amount of gooey chocolate chunks studded throughout.
Ease: Super easy!
Pros: Simple recipe to satisfy any PB & choc craving.
Cons: None!!
Would I make this again? I already have three times.

I could go on and on about how much I adore chocolate + peanut butter. But hopefully if you’re reading this post then you’re already sold on the combination.

Or you love someone who loves chocolate and peanut butter.

Peanut Butter Chocolate Chunk Bars are ultra thick, chewy, gooey, and loaded with tons of sweet peanut butter and chocolate flavor!

Either way I have a feeling these Peanut Butter Chocolate Chunk Bars will become a staple part of your baking repertoire.

They’re super quick and simple to throw together, and you likely already have most of the ingredients on hand. I love that they’re thicker than a cookie and you can serve a slice with a scoop of ice cream on top. YUM.

Peanut Butter Chocolate Chunk Bars are ultra thick, chewy, gooey, and loaded with tons of sweet peanut butter and chocolate flavor!

Most of the time when I’m craving something sweet I want something with a substantial texture. Whether that’s thick, fudgy, rich, dense, chewy, gooey, or crunchy, I’m all about the texture.

That’s probably why I’d take a cookie, bar, or brownie over a slice of cake almost any day. I might be the only one who feels this way, so if you agree please let me know in the comments below!

Super thick and chewy peanut butter chocolate chunk cookie bars

Peanut Butter Chocolate Chunk Bar Recipe Tips

The Peanut Butter

Don’t use an all natural peanut butter that separates easily in this recipe. I’ve used Skippy “natural” peanut butter, which doesn’t separate, with success.

The Chocolate

Besides the peanut butter, this is the most important ingredient! Be sure to use high quality baking chocolate, like Ghirardelli. I prefer to chop the chocolate myself so I know it’s fresh and just the right size.

I find semisweet or even milk chocolate works best in this recipe. Bittersweet is just too dark to complement the nutty slightly salty peanut butter flavor.

Brown Sugar

This is a must for this recipe! Brown sugar adds moisture, extra chewiness, and that wonderful butterscotch flavor which complements the peanut butter so well. Here’s a helpful video article I wrote about how to DIY and store brown sugar.


I tested this recipe using an 8-inch square metal baking pan. If you use a glass or ceramic pan, you’ll likely need to increase the baking time. Just a hint: metal pans tend to make for chewier crunchier corner pieces.

The bars may bake up taller at the edges and slightly sunken in the center. If this happens, don’t worry too much. It’ll taste delicious no matter what! The edges are exposed to the heat first and most intensely so they set more quickly. And because the batter is just so rich this is just a small sacrifice we must make for the most gooey ooey bars possible 😉

Cookie Customization Guide

Although these are technically cookie bars, if you enjoy learning about cookie baking, ingredients, and science then I think you’ll enjoy my free cookie customization guide.

Peanut Butter Chocolate Chunk Bars are ultra thick, chewy, gooey, and loaded with tons of sweet peanut butter and chocolate flavor!

More Cookie & Bar Recipes

Photos by Ashley McLaughlin.

August Baking Challenge

These bars were the recipe selection for the August 2018 Baking Challenge! Learn more about my monthly baking challenges here.

4.62 from 18 votes

How to make
Peanut Butter Chocolate Chunk Bars

Yield: 9 large or 16 small bars
Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 45 minutes
Peanut Butter Chocolate Chunk Bars are ultra thick, chewy, gooey, and loaded with tons of sweet peanut butter and chocolate flavor!  Download my free cookie customization guide HERE


  • 1 stick (113 grams) unsalted butter
  • 1 3/4 (350 grams) cups light brown sugar
  • 1/2 cup (135 grams) smooth peanut butter
  • 2 eggs plus one egg yolk
  • 1 teaspoon vanilla extract
  • 2 1/4 cups (286 grams) all purpose flour
  • 1 teaspoon baking powder
  • 1/4 teaspoon baking soda
  • 1/2 teaspoon salt
  • 6 ounces (170 grams) semi-sweet chocolate chunks


  1. Preheat the oven to 350°F. Line an 8 by 8-inch metal baking pan with parchment or foil.
  2. In a saucepan over medium heat, melt the butter. Add the brown sugar, stirring until smooth. Remove from the heat and stir in the peanut butter. Allow to cool.
  3. In a large mixing bowl, combine the flour, baking powder, baking soda and salt.
  4. Once the butter mixture is cool, add the eggs and yolk, one at a time, until well combined. Stir in the vanilla extract. Pour the mixture into the prepared dry ingredients, and stir to create a very thick dough-like batter. Fold in 3/4 the chocolate chunks, reserving the rest for sprinkling on top.
  5. Transfer the batter to the prepared pan, spreading evenly to the edges. Sprinkle with the remaining chocolate chunks, lightly pressing them into the batter.
  6. Bake for 30 minutes, or until the top is golden and the edges are slightly browned. Allow to cool in the pan. Use the parchment to remove the bars before cutting into squares and serving. Store in an airtight container at room temperature for up to 3 days.
Course: Dessert
Cuisine: American

About Tessa...

I share trusted baking recipes your friends will LOVE alongside insights into the science of sweets. I'm a professionally trained chef, cookbook author, and cookie queen. I love to write about all things sweet, carb-y, and homemade. I live in Phoenix, Arizona (hence the blog name!)

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  1. #
    Snath — July 25, 2018 at 5:00 pm

    Yaaassss!!! Brownies over cake ANY DAY!!! And I agree; it’s all about the texture.

  2. #
    Jillian — July 25, 2018 at 10:20 pm

    I’ve made your chewy brownies twice now, and both times were successful. I can’t wait to give this a shot

  3. #
    Nichole — July 26, 2018 at 7:48 am

    I’m also on the brownies & cookies over cake train. PS these look so awesome. My mouth is watering.

  4. #
    Amy — August 1, 2018 at 7:19 am

    Love the idea of this! Do you think this would work as one- or two-bite bars, made in a mini-muffin tin (with obvious adjustments to the cooking time)? If so, how full would you make each muffin cup, because these do look like they rise a lot.

    • #
      Tessa — August 1, 2018 at 11:01 am

      I’m not sure if a mini muffin tin would work well, but a regular muffin tin should!

  5. #
    ErHan UYAR — August 1, 2018 at 1:12 pm

    They are so good to make. My house smells amazing. thanks Tessa

    • #
      Tessa — August 2, 2018 at 9:17 am

      Yay, so happy to hear that!

  6. #
    Meg — August 2, 2018 at 12:23 am

    Hi Tessa!

    Would semisweet chocolate chips work instead of chunks for this recipe? 🙂

    • #
      Tessa — August 2, 2018 at 9:17 am

      Of course!

  7. #
    Serena — August 2, 2018 at 2:25 pm

    I’d love to make these and enter your contest!!! Sounds exciting- I’ve never done a baking contest before, although baking is probably my favorite thing to do in the kitchen. I’m right with u on cookies and bars being better than cake!!! Absolutely! There are very few cakes I like, but cookies and bars- oh my!!!

  8. #
    Barbara — August 3, 2018 at 4:12 am

    Hi Tessa,

    These sound so yummy. I have celiacs so need to try with Gluten Free flour! will let you know the outcome!.


  9. #
    Sherri — August 3, 2018 at 5:22 am

    Do you ever double your recipes? Like making these bars into a 9 x 13 pan.

  10. #
    Clem — August 4, 2018 at 5:12 am

    These look amazing! I only have salted butter on hand. Can I use that?

  11. #
    Lorraine Corbilla — August 7, 2018 at 1:56 am

    Just made this and my kitchen smells so good. Can’t wait to try it…

  12. #
    Tilly — August 10, 2018 at 7:31 am

    I made the bars and they looked fabulous but were very very dry!
    What did I do wrong as in the picture yours looked moist??

  13. #
    Debbi Sherer — August 13, 2018 at 4:54 pm

    I just made these and they are deliciously rich! I think I need to cut them into smaller pieces or invite a lot of friends over, so I don’t eat them all. Question…is the brown sugar supposed to be a packed measure or loose?

  14. #
    group d — August 17, 2018 at 4:09 pm

    Great post, I found all the information mentioned really interesting and justifying the topic of the post.I’ve made your chewy brownies two times, and both times were successful.

  15. #
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    this is the really amazing posts you have great writing skills

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  20. #
    Kimberly — September 2, 2018 at 12:30 pm

    I made these according to the directions, though I didn’t have enough chocolate chunks, so I added some choc chips. Because I didn’t want to make any other changes to the recipe, I took the bars out at the given time and appearance. The bars were still underdone in a big portion of the center. I found the bars to be too sweet; otherwise, they had a good flavor. I cannot testify to the texture since they weren’t fully baked.

  21. #
    Smeet — October 16, 2018 at 8:06 am

    This is what i need. Thanks for the good share.

  22. #
    NPCIL Jobs — December 12, 2018 at 3:50 am

    looks very nice and delicious! However, I’m really interested in how to create them! thank you for sharing the article!

  23. #
    Michelle — January 9, 2019 at 8:36 pm

    How cool does the butter mixture have to be before adding the other ingredients to it?

  24. # — January 25, 2019 at 12:09 am

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  25. #
    Shelley — January 27, 2019 at 6:04 am

    I made these yesterday for my coworkers and they were a huge hit! Everyone loved them. I did alter the recipe slightly by adding 1/4 cup of butterscotch chips into the dough. It just gives it a little extra kick.

  26. #
    Terri — January 27, 2019 at 4:14 pm

    These are delicious!!!

  27. #
    peter — February 13, 2019 at 1:20 pm

    One of the best sites in this field

  28. #
    Brenda — March 1, 2019 at 11:22 pm

    Hi Tessa,
    I just made these PB chocolate chunk bars for my ladies Bible study for next week. My good Lord, they are a piece of heaven for sure! Totally gooey and to die for! I will be making these again and again and again…lol

  29. #
    Lise — March 25, 2019 at 4:34 pm

    Just a question …how do you get the chocolate chunks from sinking in the batter when it’s baking?

  30. #
    Kristin — April 22, 2019 at 1:22 pm

    These were ok. No peanut butter flavor at all. Gooey for sure but not enough flavor.

    • #
      Tessa — April 22, 2019 at 3:42 pm

      Maybe try a different brand of peanut butter?!

    • #
      Payel — July 12, 2019 at 10:30 am

      Say Awesome not only ok it deserves

  31. #
    Latestin India — August 21, 2019 at 4:14 am

    Great post, I found all the information mentioned really interesting and really mean it. Thank you for sharing this blog with us

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