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Reeses Stuffed Chocolate Chip Cookie Bars

Reeses Stuffed Chocolate Chip Cookie Bars are the most amazing chocolate chip cookie bars with a Reeses Peanut Butter Cup surprise baked inside!

two reeses stuffed chocolate chip cookie bars stacked

May 18th is “I love Reeses Day!” If you’re a fan of Reeses Peanut Butter Cups, then you will love this day! Celebrate by eating Reeses Peanut Butter Cups, for sure. But you can also use Reese to make some fantastic desserts. How about Reeses Peanut Butter Ice Cream? Or Reeses Cheesecake? And, of course, we think these Reeses Stuffed Chocolate Chip Cookie Bars are the most decadent way ever to celebrate I Love Reeses Day! Share the Reeses love on social media today using the hashtag #ILoveReesesDay, #ReesesDay and #RecipesForHolidays. Be sure to follow all of the food holidays in May by following my May Food Holidays calendar.

“I get the Reese’s candy bar. If you read it, there’s an apostrophe. The candy bar is his. I didn’t know that. Next time you’re eating a Reese’s and some guy named Reese comes up to you and says, ‘let me have that,’ you better give it to him. I’m sorry Reese- I didn’t think I would ever run into you.”

-Mitch Hedberg

History of Reeses Peanut Butter Cups:

Harry Burnett Reese, a former dairy farmer and shipping partner for Milton S. Hershey, left the company in 1923 to start H.B. Reese Candy Company out of his basement. He began experimenting with different candy combinations. One of his most popular early sweets was the Lizzie Bar (a chocolate covered caramel and coconut bar that was named after his daughter). Five years later, he invented the Reeses Peanut Butter Cup that would become the breakout star for his company.

Reese died in 1956 and left the company to his six sons. They sold the company to Hershey for 23.5 million dollars in 1963. That was a great move for Hershey because Reeses Peanut Butter Cups went on to become Hershey’s best-selling candy. Reeses remains the number one product today for Hershey’s with 2 billion in sales per year.

chocolate chip cookie dough in glass bowl

How to make Reeses Stuffed Chocolate Chip Cookie Bars:

You will need a 9-inch square pan and some parchment paper. Make a batch of chocolate chip cookie dough. The recipe I include here is a delicious one, and it’s the right amount for using in a square pan.

two photos showing process of making reeses stuffed chocolate chip cookie bars

Pat half of the cookie dough into a parchment lined square pan. Place Reeses Peanut Butter Cups on top. Sprinkle pieces of the remaining chocolate chip cookie dough on top of the Reeses. Bake for about 30 minutes.

slab of chocolate chip cookie bars before cutting

And then you’ll have one giant slab of chocolate chip cookies with a layer of Reeses Peanut Butter Cups baked in the middle!

chocolate chip cookie bars

These Reeses Stuffed Chocolate Chip Cookie Bars are pretty much the most amazing dessert ever. If you’re a fan of Reeses (who isn’t??), then this is the dessert for you.

close up of two reeses stuffed chocolate chip cookie bars stacked

The Reeses candy surprise inside of these bars is just so delicious. These treats are addicting, and they are perfect for lovers of the iconic Reeses Peanut Butter Cup. Enjoy!

Fun Facts about Reeses:

  • Reeses Peanut Butter Cups were first referred to as “Penny Cups” because they sold for 1 cent at the time.
  • In 1978, Hershey’s developed Reeses Pieces. This new candy quickly became popular, but sales soared after the release of ET in 1982. In the movie, ET (the adorable alien) nibbles on Reeses Pieces.
  • Reeses is one of the most popular Halloween candies.
  • There are over 20 variations of the Peanut Butter Cup, including Crunchy, King Size, Sugar Free, White, Pumpkins, Hearts, Christmas Trees and more.
  • There are over 25,000 people in the United States named Reese.
  • In 2011, over 40,000 fans joined an online campaign to make May 19th National I Love Reeses Day.
  • Reeses Peanut Butter Cups are now sold in many countries across the world.
two reeses stuffed chocolate chip cookie bars stacked

Reeses Stuffed Chocolate Chip Cookie Bars

Yield: 16 bars
Prep Time: 20 minutes
Cook Time: 35 minutes
Total Time: 55 minutes

These delicious chocolate chip cookie bars are baked with Reeses Peanut Butter Cups stuffed inside of them!


  • 2¼ cups all purpose flour
  • 1½ teaspoons cornstarch
  • 1 teaspoon baking soda
  • ½ teaspoon salt
  • ¾ cup (1½ sticks) unsalted butter, melted
  • 1 cup packed light brown sugar
  • ¼ cup granulated white sugar
  • 1 large egg
  • 1 large egg yolk
  • 2 teaspoons vanilla extract
  • 1 cup milk chocolate chips
  • 16 regular-sized Reeses peanut butter cups, unwrapped


Preheat the oven to 350 degrees F. Line the bottom and sides of a 9-inch square pan with parchment paper, leaving an overhang on all sides so they can easily be lifted out after baking.

In a large bowl, whisk together the flour, baking soda, cornstarch and salt.

In a medium bowl, whisk together the melted butter, brown sugar and white sugar together. Whisk in the egg and egg yolk + the vanilla extract. Scrape the wet ingredients into the dry ingredients and stir to combine. Stir in the chocolate chips.

Transfer half of the dough to the prepared pan, and press into an even layer. Place the Reeses peanut butter cups on top of the dough in rows of four. Place spoonfuls of the rest of the chocolate chip cookie dough on top, covering as much of the PB cups as possible. If you have more chocolate chips, sprinkle a few more on the top (decorative).

Bake 30 to 35 minutes, until golden brown. Cool completely. Lift out of the pan, cut and serve.

Nutrition Information:
Yield: 16 Serving Size: 1 bar
Amount Per Serving: Calories: 477Total Fat: 26gSaturated Fat: 12gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 63mgSodium: 317mgCarbohydrates: 58gFiber: 2gSugar: 41gProtein: 9g

Nutritional information is estimated using a nutrition calculator. It's not likely to be 100% accurate.

Cherylann Jeffery

Monday 15th of August 2022

In the picture, the bottom cookie doesn’t look baked through. Could you partially bake the bottom cookie before putting on the peanut butter cups and top layer?

Lori Lange

Tuesday 16th of August 2022

All should be okay the way it is written, but you can certainly try something different if you'd like!


Saturday 4th of September 2021

These look so good! Question- what if I wanted to use a 9 x 13 pan to make a larger batch? Could I double the recipe? Thank - love your recipes!


Wednesday 25th of October 2023

@Alaina, did you try these with the doubled recipe?

Lori Lange

Thursday 23rd of September 2021

Perhaps... not sure!

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