Triple Threat Peanut Butter Cookie Bars

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Get your peanut butter fix with this peanut butter cookie bars recipe! It’s a triple threat with peanut butter chips, chopped Butterfingers, and chocolate chips baked into every bite. They are soft, chewy, and irresistible!

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Peanut butter cookie bars cut into squares with mix-ins all around

Are you looking for a peanut butter cookie bar that just SCREAMS peanut butter? Introducing triple threat peanut butter cookie bars – you start with the best peanut butter cookie bar and add peanut butter chips, chocolate chips, AND Butterfingers. If you are a PB fan, you will love these!

These cookie bars are the BEST. They start with a gooey peanut butter cookie bar (made with 100% brown sugar, like my favorite blondies) which is based on my favorite peanut butter cookie recipe. 

I added a ton of peanut butter chips, chocolate chips, and chopped Butterfinger candy bars to take these to the next triple threat level.

The texture is perfection. Soft and chewy – just the way a peanut butter cookie bar should be. I’m sharing all the tips, so they turn out perfect for you, too.

Jordan and I love these bars, and even Mel loves them! Maybe I should have named them triple-win cookie bars – no one can resist them!

Ingredients

Softened unsalted butter: if you use salted butter, omit the salt in the recipe

Peanut butter: it’s best to use a no-stir peanut butter like Skippy or Jif. Use creamy or crunchy!

Brown sugar: just brown sugar in these and it keeps them super soft.

Large Egg, Vanilla, Salt: for structure and flavor.

Milk: this is my secret peanut butter cookie ingredient!

Baking soda: A must for cookies

All-purpose flour: Be sure to measure it correctly

Mix-ins: Peanut butter chips, chopped Butterfingers, chocolate chips, and really anything you like (see variations below).

Stack of peanut butter cookie bars

1. Prepare your pan: Line a 9×13” baking pan with foil and spray it with cooking spray. Leave extra foil over the edges to make it easy to lift the bars out in one piece after they’re baked.

2. Cream: In a large bowl, beat the butter and peanut butter until smooth. Add the sugar and cream the mixture until well combined and smooth.

3. Mix: Add the egg, vanilla, milk, salt, and baking soda. Slowly add the flour and mix until combined. Stir in the peanut butter chips, chocolate chips, and candy bar pieces.

4. Bake: Press the dough into the prepared pan. Bake the bars for 20 to 25 minutes or until the edges are golden brown. Cool the bars completely before slicing and serving.

stack of peanut butter cookie bars
Loaded Peanut Butter Cookie Bars are an easy peanut butter blondie filled with any mix ins – use your favorite or anything you have!

Tips for the Best Triple Threat Bars

  • For Thicker Bars: Bake the bars in a 9×9” baking dish you want thicker cookie bars.
  • Measuring: Accurate measuring is so crucial for this recipe! So, be sure to pack the brown sugar in the measuring cup and measure the flour using the spoon and level method. Too much flour will make your cookie bars tough.
  • Mixing: For the best result, be sure to use softened butter. It’s key for getting the right texture and will make mixing easier. Softened butter won’t create lumps in the dough.
  • Baking: Overbaking the bars will make them hard instead of soft and chewy. The first time you make them keep an eye on them and take them out of the oven once the edges are golden. The baking time in the recipe is just an estimate – always check early, especially the first time you make them.
  • Cooling and Storage: The bars will set as they cool, so wait to slice them until they are thoroughly cooled. Be sure to store them in an airtight container – they should keep well at room temperature for a few days. You can also freeze them for up to a month.
Overhead shot of stacked peanut butter cookie bars

Recipe Variations

The best part about this recipe is that you make the “triple threat” part whatever you like best! 

We love peanut butter, candy bars, and chocolate but feel free to use your favorite add-ins to create your own cookie bar. Here are some suggestions to switch up this peanut butter cookie bars recipe:

  • Any chopped candy bar you like should work – peanut butter cups, snickers, Heath bars, Almond Joys are just a few ideas.
  • Add some nuts – chopped walnuts, almonds, and peanuts are all excellent choices.
  • Switch up the chips – use different kinds of chocolate chips or try white chocolate, butterscotch, or other baking chips that you like.
  • Make these LOADED Peanut Butter Cookie Bars by adding up to 3 cups of a mixture of mix-ins – I love cleaning out my pantry and making these cookie bars.

FAQ

Can Peanut Butter Cookies be made into bars?

Yes – easily. I prefer this recipe as bars to my normal peanut butter cookie recipe but either one works.

What pan is best for cookie bars?

A 9×13-inch pan is best – it makes a nice size bar.

How do you store peanut butter cookie bars?

Store these in an airtight container on the counter for up to 3 days.

Can you freeze peanut butter cookie bars?

Yes you can – just freeze them in an airtight container for up to 3 months.

These Triple Threat Peanut Butter Cookie Bars are the BEST bar cookie recipe! Peanut butter cookies, peanut butter chips, Butterfingers, and chocolate! Everyone loved these!
Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Yield 24 bars
Serving Size 1 serving

Ingredients

  • ½ cup (113g) unsalted butter , softened
  • ¾ cup (200g) peanut butter (creamy or crunchy, use a no-stir brand)
  • 1 cup (200g) packed brown sugar
  • 1 large egg
  • 1 teaspoon vanilla extract
  • 1 tablespoon milk
  • ¼ teaspoon salt
  • 1 teaspoon baking soda
  • 1 ½ cups all purpose flour
  • 1 cup peanut butter chips
  • 1 cup chopped Butterfingers pieces
  • 1 cup chocolate chips

Instructions

  • Preheat oven to 350°F. Line a 9×13” pan with foil and spray with nonstick cooking spray.
  • Beat butter and peanut butter until smooth with a hand or a stand mixer (fitted with the paddle attachment). Add brown sugar and cream until smooth. Mix in egg, vanilla, milk, salt, and baking soda. Slowly stir in flour until combined, then add both chips and candy pieces. Stir until combined.
  • Press the dough into the prepared pan. Sprinkle with more chips and Butterfingers pieces, if desired. Bake for 20-25 minutes, or until the edges are golden brown. Cool completely before slicing into bars.
  • Store in an airtight container for up to 3 days or freeze for up to one month.

Recipe Notes

Make LOADED Peanut Butter Cookie Bars: use up to 3 cups of any kind of mix-ins you like!
  • Chips: chocolate, white chocolate, butterscotch, toffee bits
  • Nuts
  • Chopped Candy Bars
  • Chopped Oreos

Nutrition Information

Serving: 1serving | Calories: 258kcal | Carbohydrates: 31g | Protein: 5g | Fat: 13g | Saturated Fat: 7g | Trans Fat: 1g | Cholesterol: 20mg | Sodium: 149mg | Potassium: 94mg | Fiber: 1g | Sugar: 21g | Vitamin A: 146IU | Vitamin C: 1mg | Calcium: 27mg | Iron: 1mg

Nutritional information not guaranteed to be accurate

Course Dessert
Cuisine American
Keyword cookie bar, peanut butter
Stack of peanut butter cookie bars with recipe title on top of image

These Peanut Butter Cookie Bars are soft, chewy and everyone loves them! This recipe is a fun twist on your classic peanut butter cookie.

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20 CommentsLeave a comment or review

  1. As always, these look beyond delicious! You are definitely my go-to for yummy baked goods. I use MasterCook to store all my recipes and I have a “CrazyforCrust.com” category!

  2. Humm, reading these I am drooling a bit and also wondering if I could top them with Reese’s peanut butter candies. Then, I could call it quadroople instead of triple. Will be trying for sure! 

  3. I guess that makes me the sugar grandmother!!? Sorry, I guess I started it when you were little and I had to have desserts around. However, you have surpassed my baking abilities and I wish there were some of these left for me. xoxo

  4. lol I love that you’re the sugar mom and I totallyyyy adore all the peanut buttery goodness in these bars!

  5. Those butterfinger bits sound amazing in here- also Target is totally amazing and terrible at the same time, I feel ya!

  6. These look amazing, Dorothy! I know what you mean about Target, it’s like they spray some kind of spending-inducing-drug into the air and I suddenly remember that I need EVERYTHING;-)

  7. The Sugar Mom, yep I can relate. Grape tomatoes and watermelon are nice and all but I’m totally in your camp with passing out desserts 🙂 When I go out to dinner with people, go on hair appts, etc. I whip out a half of a pan of brownies, cake, etc from my purse and am like HERE. And I want these bars! Glad Mel loved them!

  8. Holy peanut butter – this looks fantastic! Target is evil. You can’t leave that store without spending $100! 🙂

  9. You were just lying to yourself if you thought you could clear Target without spending about $200. I never leave Target without spending that much. It’s a constant in my life. I never mean to…but there were some pretty maxi dresses there last week!
    These are AMAZING. I want to hang out at the beach with you and get some of these!