Chocolate Peanut Butter Brownies

These Chocolate Peanut Butter Brownies are rich and fudgy and filled with peanut butter morsels. I topped them with a fluffy peanut butter frosting and loads of Reese’s peanut butter cups. It’s the ultimate brownie!

Fudgy Chocolate Brownies with Reese's PB morsels, fluffy Peanut Butter Frosting and chopped Reese's PB Cups!

Chocolate and Peanut Butter

There’s no debating it: people love chocolate and peanut butter together. Some of the most popular recipes on this site feature this winning combination, like Chocolate Peanut Butter Fudge and this Chocolate Peanut Butter Cheesecake Cake.

People also love brownies! Especially fudgy brownies. Throw some Reese’s peanut butter cups and a fluffy peanut frosting on top and you’ll understand why I call this “the ultimate brownie”!

Your search for the perfect chocolate peanut butter brownie is over! This recipe is made from real chocolate squares, with peanut butter chips baked into every bite!

Fudgy Chocolate Brownies with Reese's PB morsels, fluffy Peanut Butter Frosting and chopped Reese's PB Cups!

Ingredient Notes

  • Unsweetened Chocolate Squares – I use the wrapped 1 oz baking squares. Make sure to double check the label to make sure it’s unsweetened baking chocolate!
  • Peanut Butter – Creamy peanut butter that’s sweetened and shelf stable, like Jiff or Skippy, works best. The natural style peanut butter will have a different consistency and taste.
  • Reese’s peanut butter cups – I used 24 Reese’s miniatures, chopped into small pieces. If you prefer to use full size cups, you’ll only need about 12.

Easy Overview

These brownies are so easy to make!

Melt the chocolate in the microwave with butter, then mix in the sugar, eggs and flour. Fold in the peanut butter morsels and bake in a brownie pan for about 45 minutes.

Let your brownies cool completely while you make the frosting. I like the chill them in the fridge before frosting so they firm up a little better!

To make the frosting, just beat your peanut butter with powdered sugar, milk and butter until smooth and fluffy. Spread the frosting over the cooled brownies in the pan, then sprinkle on chopped Reese’s cups.

Cut into bars and serve or store!

Fudgy Chocolate Brownies with Reese's PB morsels, fluffy Peanut Butter Frosting and chopped Reese's PB Cups!

Tips & Tricks

  • The brownies will be very soft and fudgy. That’s how I like them! I recommend chilling them in the fridge for about 20 – 30 minutes before adding the frosting to help them set more.
  • Store any brownies you’re not eating right away in an airtight container at room temperature for up to 3 days.
  • Stir the butter and chocolate mixture after every 30 seconds in the microwave. The stirring helps speed up the melting process. It takes my chocolate about 90 seconds total to become melted enough to combine with the remaining ingredients.
  • Line your brownie pan with parchment paper to make it easier to remove the cooled brownies from the pan.

Recipe FAQs

Why are my brownies liquidy?

This recipe makes brownies that are very soft and fudgy, as opposed to cake like, however they should not look soupy when you take them out of the oven.
It’s possible that your ingredient ratios were off if your brownies don’t seem to firm up at all. Always be sure to check and double check the amount of each ingredient. You can also chill the brownies in the fridge to help them firm up even more after baking too!

Can you freeze these brownies?

I don’t recommend freezing these, as I find it tends to affect the texture and taste of a fudgier brownie. Instead, store them in an airtight container at room temperature and try to eat them within a few days of baking–not that this is a difficult task for me!

What size brownie pan should I use?

I always use an 8 x 8 square inch glass baking dish for making this brownie recipe.

What kind of peanut butter is best in this recipe?

I prefer to use the “regular” peanut butter (you know, the kind with the sugar!) for peanut butter frosting. It whips into the frosting more smoothly than the natural and organic varieties.

You can’t go wrong with this brownie recipe! Packed with rich chocolate flavor, peanut butter morsels and frosting, these Chocolate Peanut Butter Brownies are a peanut butter lover’s dream.

Yield: 16 brownies

Chocolate Peanut Butter Brownies

Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour

Rich, fudgy Brownies filled with peanut butter morsels and topped with a fluffy peanut butter frosting. Loads of chopped Reese's peanut butter cups make this the ultimate, classic holiday dessert!


For the Brownies:

  • 6 (1-ounce) squares unsweetened chocolate
  • 1 cup unsalted butter
  • 2 cup granulated sugar
  • 3 large eggs
  • 1 ⅓ cup all-purpose flour
  • 10oz peanut butter morsels

For the Frosting:

  • ½ cup unsalted butter
  • ½ cup creamy peanut butter
  • 2 cup powdered sugar
  • 2 Tbsp skim milk
  • 24 Reese's peanut butter cups miniatures, chopped


  1. For the brownies, preheat oven to 325 degrees F. Line an 8inch square baking dish with parchment paper. Set aside.
  2. In a large microwave safe bowl, combine unsweetened chocolate with butter. Melt on high heat for 30 second intervals, stirring after each addition (about 90 seconds total).
  3. Add sugar and stir until combined. Add eggs, one at a time until fully incorporated. Mix in flour completely. Fold in the peanut butter morsels.
  4. Pour into prepared baking dish and bake for about 45 minutes. Remove from oven and cool completely before frosting. Brownies will be soft and fudgy! Refrigerate brownies before frosting to help them firm up!
  5. For the frosting, beat butter, peanut butter, powdered sugar and milk for 5 minutes using an electic mixer with whisk attachment on medium high. Spread over cooled brownies. Top with chopped Reese's peanut butter cups. Cut into bars and enjoy! Store in an airtight container for up to 3 days.

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 833Total Fat: 51gSaturated Fat: 21gTrans Fat: 0gUnsaturated Fat: 15gCholesterol: 84mgSodium: 365mgCarbohydrates: 90gFiber: 4gSugar: 72gProtein: 16g

*Nutrition facts are an estimate and not guaranteed to be accurate. Please see a registered dietitian for special diet advice.

Did you make this recipe?

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About Aimee

Aimee is a dessert lover (specifically rice krispie treats), workout enthusiast, self-taught foodie, and recipe creator.

Learn more about Aimee.

Affiliate Disclosure:**There may be affiliate links in this post! By clicking on them, or purchasing recommended items I may receive a small compensation. However, I only recommend products I love! Thank you for supporting Shugary Sweets! See my disclosure policy for more info**

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Posted on December 2, 2013

Comments & Reviews

  1. Does anyone actually comment AFTER making these recipes? I also was excited to try them as they look AhhhMAZING! However, I was really disappointed after baking them. I put them in the 325 oven for 45 minutes and when I took them out, they were still almost liquid in the middle. I ended up baking them an extra 30+ minutes just trying to get the middle part to bake. Fortunately it didn’t burn with the parchment in the bottom but not sure what I did wrong as I followed the instructions exactly with the exception that I may have had a tiny bit more of chocolate than it called for.

    1. Hmmm, I’m sorry they didn’t turn out for you. I’ve used this brownie base in many many recipes with much success. It’s definitely a more fudgy brownie vs cakey. Adding more melted chocolate could throw off the texture, but it definitely should not have needed another 30 minutes to bake!

  2. I’m going to make these for my cousin’s birthday next week, she loves brownies but I think she’ll like these even more!

    Regarding the brownie recipe, does it call for 6oz of chocolate? I just want to make sure I’m not reading it wrong.


  3. peanut butter and chocolate is the best combination in desserts, in my opinion! these brownies look SO good and I love how thick and mile-high they are!

  4. Possibly the most awesome idea ever to have a party with Kisses and Reese’s – brilliant! Love these brownies Aimee!

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