These easy Peanut Butter Cookie Bars are ultra soft, chewy, and loaded with chocolate chips. Unlike most bar recipes that turn out dry or cakey, this version is tested to stay fudgy every single time with simple pantry ingredients.
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Why You'll Love These Peanut Butter Bars
We're just in peanut butter mode this week! After Tuesday's Peanut Butter Balls recipe, I thought I'd follow up today with a rich, decadent Peanut Butter Cookie Bar recipe you guys are going to go nuts over (pun totally intended).
I'm all about a simple recipe - and that's exactly what I tried to do here. I researched a ton of peanut butter bar recipes for this post and tried my best to take it down to the fewest ingredients and the easiest method. I tested and perfected until I finally got a cookie bar that's so soft and chewy - without much work.
If you love to bake but don't love an over-complicated recipe, this is the perfect dessert for you. I hope you enjoy!
Ingredient Notes
(See recipe card at the bottom of this post for exact ingredient measurements.)
- Creamy Peanut Butter: For the best results, stick with a traditional "no-stir" peanut butter (the standard stuff at the grocery store is perfect). Natural peanut butters that require stirring contain extra oil that can separate during the baking process, leaving your bars greasy on top and crumbly underneath.
- Unsalted Butter: Melting the butter breaks down the sugar faster, a great trick to getting a fudgy, blondie-like texture instead of a cakey square.
- Light Brown Sugar: We are completely skipping white granulated sugar here! Brown sugar contains molasses, which is a great way to make sure your bars stay soft and chewy.
- Eggs: Make sure your eggs are at room temperature so they easily mix into the peanut butter mixture without chilling the butter.
- All-Purpose Flour: Be sure to spoon and level your flour into the measuring cup rather than scooping directly from the bag...this prevents packing too much flour into the cup, which can make your bars dry.
- Semi-Sweet Chocolate Chips: Here's where one of my favorite tricks to getting pretty bars comes into play! Dividing the chocolate chips will allow you to fold most of them into the batter and save a quarter cup to press directly into the top right out of the oven for that perfect, bakery-style look.
Additions & Substitutions
- Switch up the Mix-ins: Semi-sweet chocolate chips are the classic choice, but you can easily swap them for peanut butter chips, dark chocolate chunks, or Reese's Pieces.
- Add a Salty Crunch: Use crunchy peanut butter for extra texture in the dough. You can also sprinkle sea salt over the top right after baking to balance out the sweetness.
- Nut-Free Alternatives: Swap the peanut butter for creamy almond butter or sunflower seed butter. Just make sure it's a "no-stir" kind to keep that chewy texture in your bars.
- Gluten-Free Option: Use a 1:1 gluten-free baking flour blend. It might change the chewiness a little, but the brown sugar will keep them plenty moist.
How to Make Peanut Butter Cookie Bars
- Mix the Wet Ingredients. In a large mixing bowl, stir together the creamy peanut butter, room temperature butter, packed light brown sugar, vanilla extract, and room-temperature eggs with a hand mixer until the mixture is completely smooth and uniform.
- Add the Dry Ingredients. Add the all-purpose flour and baking soda directly into the same bowl. Stir the mixture just until the flour disappears and a thick dough forms. Be careful not to overmix at this stage; you can over-develop the gluten and make the bars tough.
- Fold in the Chocolate Chips. Using a spatula, fold the semi-sweet chocolate chips (reserving a small handful for later) into the peanut butter batter until they are evenly mixed.
- Prep and Press. Transfer the thick dough into the pan and press it into an even layer using your spatula or clean hands. No cooking spray needed - the butter in the cookie dough will keep the peanut butter bars from sticking.
- Bake to Perfection. Bake at 375°F for 18-22 minutes. You are looking for the edges to turn a light golden brown, while the very center should still look soft and a little bit jiggly.
- Top and Cool. This is one of my favorite tricks for pretty cookie bars! Remove the bars from the oven and immediately press the remaining chocolate chips into the top. Let cool completely in the pan for 45-60 minutes before slicing to allow them to fully set.
Leftovers & Storage
It's fine to keep leftover cookie bars stored un-refrigerated on your counter...just make sure to cover the bars in an airtight container to keep them soft. I recommend enjoying these within 3-4 days of baking them.
Freezing: While you can freeze your peanut butter chocolate chip cookie bars, sometimes the texture can change a little. They often thaw a little bit more cakey and dry. As long as you're ok with that, go for it! I recommend storing these in a freezer bag and thawing them to eat again within 3-4 months of freezing them for best texture.
Leslie's Helpful Tips & Tricks
- Proper Flour Measurement: Packing flour into your measuring cup can cause dry cookie bars. Always fluff your flour with a spoon, scoop it into the cup, and level it off with a flat edge.
- The "Jiggle" Test: To avoid overbaking, pull the bars from the oven when the edges are starting to brown but the center still has a little bit of a jiggle. They will finish setting as they cool.
- Room Temperature Eggs: Cold eggs can cause the butter to seize up and clump; let your eggs sit on the counter for 30 minutes or so, or place them in a bowl of warm (not hot) water for 5 minutes before mixing.
- Don't Overmix the Flour: Once you add the dry ingredients, stir just until you no longer see white streaks; overworking the dough can turn your chewy bars into hockey pucks.
FAQs & Troubleshooting
More Dessert Bars
Enjoy, friends! If you give the recipe a try, let me know what you think in the comments below. And make sure to follow along for the latest recipes!
Peanut Butter Cookie Bars
Ingredients
- 1.5 cups creamy no-stir peanut butter
- ¼ cup salted butter (½ stick, room temperature)
- 1.5 cups light brown sugar (packed)
- 2 large eggs (room temperature)
- 1 teaspoon vanilla extract
- 1.5 cups all-purpose flour
- 0.5 teaspoon baking soda
- ⅔ cup semi-sweet chocolate chips (small handful reserved for topping)
Instructions
- Mix Wet Ingredients: In a large mixing bowl, use a hand mixer to blend the peanut butter, butter, brown sugar, vanilla extract, and eggs until completely smooth.
- Add Dry Ingredients: Add the flour and baking soda directly into the same bowl. Stir just until the flour disappears; do not overmix.
- Fold the chocolate chips (reserving a small handful for later) into the batter with a spatula.
- Press the dough evenly into a greased 7x11" baking dish.
- Bake at 375°F for 18-22 minutes. The edges should be light golden brown, but the center will still look soft.
- Top and Cool: Remove from the oven, immediately sprinkle the remaining handful of chocolate chips over the top, and press them in gently. Let cool completely in the pan for 45-60 minutes before slicing into squares.
Notes
- Use conventional creamy peanut butter (not natural peanut butter) for the best texture.
- Room temperature eggs mix more evenly and help prevent dense bars.
- Don't pack flour while measuring to avoid dry bars.
- Mix just until the flour disappears to keep the bars soft and chewy.
- Bake until the edges are lightly golden and the center still has a slight jiggle.
- Let bars cool completely before slicing for clean squares.
- Store in an airtight container at room temperature for up to 4 days.
- Freeze baked bars for up to 3-4 months if desired.
Nutrition Facts
Leslie Lambert is a lifestyle writer and content creator specializing in home organization, family recipes, and intentional living. With 17 years of experience in blogging and digital storytelling, she helps busy women create calm, purposeful homes they love.
