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These Peanut Butter Blondies are my favorite chewy blondie recipe with mini Reese’s cups, Reese’s chips, and milk chocolate chips folded into the batter. They have a luscious, creamy Reese’s peanut butter icing on top.

Reeses Peanut  Butter Blondies bitten
Seven Layer Bars Stacked
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Brace yourselves. These Reese’s Peanut Butter Blondies are insanely good.

It’s an easy brown butter blondie recipe with mini Reese’s peanut butter cups, Reese’s peanut butter chips, and Ghirardelli milk chocolate chips folded into the batter. And because that just wasn’t enough, I slathered a thick layer of Reese’s peanut butter icing on top.

Reeses Peanut Butter Blondies sliced on wooden surface

It’s a Reese’s peanut butter trifecta!

The brown butter blondie perfectly compliments the peanut butter and milk chocolate. It has a slight crunch on the outside but is chewy and dense on the inside with Reese’s and milk chocolate in every single bite!

Reeses Peanut Butter Blondies sliced stacked

The Reese’s peanut butter icing deserves it’s own moment in the spotlight, because it’s sensational. It is silky smooth and creamy, and it tastes just like the inside of a Reese’s cup but better.

That’s right, I said better.

Reeses Peanut Butter Blondies tall stack peanut butter frosting

But…I can’t guarantee that these peanut butter blondies will be around long enough to ice…

Reeses Peanut Butter Blondies unsliced in baking tin

I like to bake my blondies (and brownies) in a glass baking dish because I have found that, when baked in a metal pan, the outside cooks too quickly and can end up too crunchy when the center is finally cooked. When cooked in glass or pyrex, the blondies will develop a slightly crispy crust around the edges but will still be soft and chewy all the way throughout. Though either is possible. Clearly when I remade these in 2022, I used a pretty vintage baking dish and all was well.

Reeses Peanut Butter Blondies bitten
5 from 1 ratings

Reese’s Peanut Butter Blondies

These Peanut Butter Blondies are my favorite chewy blondie recipe with mini Reese’s cups, Reese’s chips, and milk chocolate chips folded into the batter. They have a luscious, creamy Reese’s peanut butter icing on top.
Prep: 20 minutes
Cook: 20 minutes
Total: 40 minutes
Servings: 32 people

Ingredients 
 

For the Blondie:

For the Reese’s Peanut Butter Icing:

Instructions 

To make the Blondie:

  • Preheat oven to 350°. Generously butter a 13x9x2 inch glass or pyrex baking pan.
  • Whisk flour, baking powder, and salt in a medium bowl and set aside.
  • Melt butter in a medium skillet over medium heat, swirling several times a minute, until browned bits cling to the bottom of the pan and the butter takes on a slightly nutty aroma. Transfer brown butter to a medium bowl. Be sure to get all the nutty goodness from the pan!
  • Add brown sugar and beat, with an electric mixer, until well combined and mixture resembles wet sand, 2-3 minutes.
  • Add eggs and vanilla; beat until fluffy, 2 minutes. Add dry ingredients and beat until smooth. The batter will be very thick.
  • Fold in milk chocolate chips, peanut butter chips and mini Reese’s cups. Turn out into prepared baking dish.
  • Using an offset spatula, evenly spread batter in pan.
  • Bake blondie until golden brown or the center no longer jiggles when gently shaken, 20-25 minutes. The toothpick test will not work here because of all the mix-ins. Be careful not to over bake! Let cool completely in pan on a wire rack.

For the Icing:

  • Combine butter, milk, and salt in a heatproof bowl; cook over a pan of simmering water (bain marie) until butter is melted and mixture is hot to the touch. Stir frequently.
  • Remove from heat and add chips to the bowl; beating with an electric hand mixer until smooth and the chips have completely melted.
  • Cool. This step only takes about 15 minutes, especially if you stir it frequently.
  • Gradually add in powdered sugar and beat until thick enough to spread but not runny.
  • Spread onto cooled blondies with an offset spatula.

Notes

Yield: 32 Blondies
You can halve this recipe and use an 8 x 8 inch baking dish.

Nutrition

Calories: 267kcal | Carbohydrates: 36g | Protein: 3g | Fat: 13g | Saturated Fat: 7g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 1g | Cholesterol: 30mg | Sodium: 205mg | Potassium: 106mg | Fiber: 1g | Sugar: 29g | Vitamin A: 233IU | Vitamin C: 1mg | Calcium: 55mg | Iron: 1mg
Course: Dessert
Cuisine: American
Calories: 267
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Hi, I’m Chef Lindsey!

I am the baker, recipe developer, writer, and photographer behind Chef Lindsey Farr. I believe in delicious homemade food and the power of dessert!

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17 Comments

  1. My frosting was runny and not fluffy like yours. I even added a bit more powdered sugar to try to stiffen it up but to no avail. What did I do wrong?

    1. Hi Kim! I’m sorry! Perhaps the mixture wasn’t cool enough before you added the powdered sugar? You could try putting it in the fridge next time to firm up the butter before beating it?

  2. These are good but extremely sweet. I love sweets and could only eat one piece and I was done. Could use less brown sugar I think and would be just as delicious without the icing.

  3. Holy cow this is good. I could barely get it baked because I couldn’t stay out of the batter. I imagine this is what heaven would taste like, if it had a taste

    1. LOL! I’m glad I’m not the only one who can stop eating the batter! I had the same problem, so you are in good company! I am overjoyed that you loved them! I also couldn’t stop eating the icing…”just one more taste, just to be sure…”

      1. I haven’t made the icing yet, but if it’s as good as the batter, these aren’t going to my church tomorrow. Haha my husband will have eaten them all

  4. Peanut butter and chocolate are so amazing together. I love Reece’s cups..I think I’d be addicted to something that’s “better”. Yum!
    I can’t help but to think of how sorry I feel for those with nut allergies, missing out on one of life’s little pleasures like with the marriage of peanut butter and chocolate. Hehe sorry for bringing up a bummer, but every time I see or eat yummy things with nuts in them, it’s what I always think about.

    1. Such a downer! Lol! I would be so depressed, but then again maybe they don’t know what they’re missing!

      These are fabulous…if you like Reese’s then these are your new BFF

    1. They are!!! You, with your love of PB, would definitely love these blondies. Brown butter AND Reese’s. What’s not to love?!

  5. let me get this straight: browned butter blondies, chock full of Reese’s goodness AND frosted with with a Reese pb icing??!

    *dies*

    1. lol! They are so good that I ate 4 of them just while shooting…only the ugly ones, of course. It’s a job and someone has to do it! 😉

  6. OMG! The blondie part already looks fantastic, but that peanut butter icing takes them over the top! Pinning and wishing I had one of these right now.

    1. Thanks for the pin, Christin! The icing is so ridiculously good. I had to fill the bowl with water so that I would stop eating all the leftover! Eeep!