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Peanut Butter Cookie Bars

Lisa

By Lisa

Feb 26, 2026

15 min prep
30 min cook
12 servings
Jump to Recipe
Peanut Butter Cookie Bars

Get ready to indulge in the ultimate dessert experience with these Peanut Butter Cookie Bars! Soft, chewy, and bursting with rich peanut flavor, these bars are the perfect treat for any occasion. Whether you're sharing them with friends or enjoying them solo, you’ll find it hard to resist their melt-in-your-mouth goodness.

With creamy peanut butter, luscious chocolate chips, and a buttery base, these cookie bars are not just a dessert; they’re a hug in a baking dish! Follow along, and I promise you’ll have a batch of deliciousness to enjoy in no time.

Why You'll Love This Recipe

  • Irresistible Flavor: The combination of peanut butter and chocolate is a classic that never disappoints.
  • Easy to Make: With simple ingredients and straightforward steps, anyone can whip these up!
  • Perfect for Sharing: Cut them into squares and watch them disappear at your next gathering.
  • Customizable: Add your favorite nuts or mix-ins to make them uniquely yours!

About the Ingredients

Creamy Peanut Butter

This is the star of the show! The creamy texture and rich flavor create a delicious base for these cookie bars.

Unsalted Butter

Butter adds moisture and richness, helping to create that soft and chewy texture we all love.

Granulated Sugar

This sweetener helps to create a lovely golden crust while contributing to the overall sweetness of the bars.

Packed Light Brown Sugar

The molasses in brown sugar adds depth and a hint of caramel flavor, enhancing the peanut butter taste.

Large Eggs

Eggs bind the ingredients together and help with the rise, ensuring your bars are perfectly fluffy.

Vanilla Extract

Just a splash of vanilla elevates the overall flavor profile, making these bars even more delicious.

All-Purpose Flour

This is the backbone of the recipe, providing structure and stability to your cookie bars.

Baking Powder

Baking powder helps the bars rise and gives them that lovely, soft texture.

Salt

A pinch of salt balances the sweetness and enhances the flavors of the other ingredients.

Semi-Sweet Chocolate Chips

These little gems melt beautifully and add a delightful chocolatey surprise in every bite.

Chopped Peanuts (Optional)

Add a crunchy texture and extra peanut flavor if you’re looking to amp up the nutty goodness!

Tips & Tricks

Grease the Baking Dish Well

To ensure easy removal of the bars, make sure to grease your baking dish thoroughly before spreading the dough.

Don’t Overmix

Mix just until the dry ingredients are combined to keep your bars from becoming tough.

Cool Completely Before Cutting

Allow bars to cool completely in the pan for cleaner cuts and perfectly shaped squares.

Use High-Quality Ingredients

Using good quality peanut butter and chocolate chips can make a noticeable difference in flavor.

Experiment with Mix-Ins

Feel free to add butterscotch chips, white chocolate, or even dried fruits for a unique twist!

Pro Tips

  • Choose Creamy Over Crunchy: Creamy peanut butter integrates better into the dough for a smooth texture.
  • Let It Rest: Allow the dough to sit for a few minutes before spreading it; this helps with texture.
  • Use a Toothpick to Check Doneness: If it comes out with a few moist crumbs, they’re ready to come out of the oven.
  • Store in an Airtight Container: For the best freshness, keep your bars sealed tightly at room temperature.

Step-by-Step Instructions

Preheat the Oven

Begin by preheating your oven to 350°F (175°C) and greasing a 9x13-inch baking dish to prepare for the batter.

Mix the Wet Ingredients

In a large mixing bowl, beat together the creamy peanut butter, softened butter, granulated sugar, and brown sugar until the mixture is creamy and smooth.

Add Eggs and Vanilla

Incorporate the eggs one at a time, beating well after each addition, then stir in the fragrant vanilla extract for added flavor.

Combine Dry Ingredients

In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add this dry mixture to the wet ingredients, mixing just until combined.

Fold in Chocolate Chips

Gently fold in the semi-sweet chocolate chips and chopped peanuts, if you’re using them, ensuring a lovely even distribution.

Spread and Bake

Spread the dough evenly into the prepared baking dish, smoothing the surface with a spatula. Bake for 25-30 minutes until the edges are golden brown and a toothpick comes out clean.

Cool Before Cutting

Allow the bars to cool completely in the pan before cutting them into squares for the perfect serving size.

Delicious Variations

Nutty Chocolate Swirl

Add a swirl of Nutella or chocolate fudge into the dough for an extra chocolatey treat.

Oatmeal Peanut Butter Bars

Incorporate rolled oats into the batter for a chewy texture and nutty flavor.

Peanut Butter Banana Bars

Mix in mashed ripe bananas for a fruity twist that pairs perfectly with peanut butter.

How to Store Peanut Butter Cookie Bars

Refrigerator

Store the bars in an airtight container in the refrigerator for up to one week to maintain freshness.

Freezer

Wrap individual bars in plastic wrap and store in a freezer-safe container for up to three months.

Reheating

If frozen, thaw overnight in the refrigerator, then enjoy at room temperature or warm in the microwave for a few seconds.

Frequently Asked Questions

Can I use crunchy peanut butter instead?

Absolutely! Crunchy peanut butter can add a delightful texture to the bars.

How do I know when the bars are done baking?

When the edges are golden brown and a toothpick inserted into the center comes out clean, they are ready!

Can I substitute other types of flour?

Yes, you can use whole wheat flour or gluten-free flour, but it may alter the texture slightly.

How do I make these bars even more decadent?

Consider drizzling melted chocolate on top or adding a sprinkle of sea salt after baking for an extra touch of indulgence!

Now that you have all the tips and tricks to create these delectable Peanut Butter Cookie Bars, it’s time to get baking! You’ll be amazed at how quickly they disappear, so make sure to save some for yourself. Enjoy every bite!

Peanut Butter Cookie Bars

Peanut Butter Cookie Bars

Soft, chewy, and packed with peanut flavor, these cookie bars combine creamy peanut butter, chocolate chips, and a buttery base for the perfect treat to share or enjoy anytime.

15 min
Prep Time
30 min
Cook Time
12
Servings
350 kcal
Calories

Ingredients

Instructions

  1. 1 Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish.
  2. 2 In a large mixing bowl, beat the peanut butter, butter, granulated sugar, and brown sugar until creamy and smooth.
  3. 3 Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
  4. 4 In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add the dry ingredients to the wet mixture, mixing just until combined.
  5. 5 Fold in the chocolate chips and chopped peanuts, if using.
  6. 6 Spread the dough evenly into the prepared baking dish. Use a spatula to smooth the surface.
  7. 7 Bake for 25-30 minutes, or until the edges are golden brown and a toothpick inserted into the center comes out clean.
  8. 8 Allow to cool completely in the pan before cutting into bars.

Chef's Note

For extra crunch, add the optional peanuts. You can also drizzle melted chocolate over the cooled bars for a bakery-style finish. Store in an airtight container for up to 5 days.

Servings: 12

Cuisine: American

Course: Dessert

Nutrition (per serving): 12gg protein