Brownies & Bars

Ultimate Chocolate Peanut Butter Brownies

4.77 from 42 votes
Sometimes we all need a peanut butter and chocolate fix to get us through the week — and my Ultimate Chocolate Peanut Butter Brownies recipe does the trick.
A grid of Ultimate Peanut Butter Brownies and a jar of milk to go with them.

Hi Bold Bakers!

If you’re anything like the rest of the population, then you’re obsessed with the combination of rich chocolate and creamy peanut butter. Food scientists, an analytical and delicious-sounding job, have performed a lot of research studies as to why chocolate and peanut butter go so well together. But really, who cares so long as we get to eat it, especially in this delicious recipe!

Chocolate and peanut butter are the power couple of our baking world, and my homemade peanut butter brownie recipe is the ultimate matchmaker.

What makes my chocolate peanut butter brownies different from the rest? Simple — these fudgy chocolate brownies swirled with nutty peanut butter and topped with salty peanuts on top are as easy to make as they are hard to resist

What Kind Of Peanut Butter You’ll Need

There’s nothing wrong with cherishing your natural (and typically more expensive) jar of nut butter on top of your breakfast toast or trying your hand at making your own, but I find that when it comes to baking with peanut butter, the cheaper stuff from any old supermarket is best. 

Natural peanut butter usually contains two ingredients: peanuts and salt. Meanwhile, your favorite Jif or Skippy-type brand also has sugar and hydrogenated vegetable oil, which is used to prevent separation and help enhance the spreadability of that delicious peanut butter — something that is ideal for creamy, melt-in-your-mouth baking.

But either smooth and crunchy versions of peanut butter will work! That is a debate you must have with your household. 

Ultimate Peanut Butter Brownie recipe bake and arranged in a grid of squares.

What You Need To Make Peanut Butter Brownies

How To Make Peanut Butter Brownies

Don’t be intimidated by the thought of adding a peanut butter swirl throughout these rich chocolate brownies! It’s a super easy process. Here’s how simple it is (and don’t forget to get the full recipe with measurements, down below):

  1. Combine sugar, water, and chocolate in a microwavable bowl. Microwave until chocolate has melted, usually around 2-3 minutes. 
  2. Allow mixture to slightly cool then whisk in oil, eggs, and vanilla.
  3. In a separate bowl, sift together the flour, cocoa powder, baking powder, and salt.
  4. Add dry ingredients to the wet ingredients and mix until they are just combined, making sure you do not over mix.
  5. Swirl in 1/2 cup of peanut butter into the batter, leaving big streaks.
  6. Pour batter into buttered and lined baking pan and pour on the remaining peanut butter. Swirl the peanut butter over the top of the brownies. Top with chopped peanuts.
  7. Bake at 350°F (180°C) for 45-60, underbaking the brownies to keep them fudgy inside.
  8. Cool for at least 30 minutes, cut, top with some vanilla ice cream and prepare to enter peanut butter and chocolate heaven.

A close up of an Ultimate Peanut Butter Brownie, showing texture.

Gemma’s Pro Tips for Chocolate Peanut Butter Brownies

  • You can use any nut butter, but the cheaper grocery store versions work the best when baking.
  • If you are using natural peanut butter, stir it very well before adding to the brownies to make sure the naturally separated oil blends in!
  • Since conventional peanut butter already has sugar, use bittersweet chocolate (70%) to give your brownies a perfect balance of richness and sweetness. 
  • Brownies continue to cook when you take them out of the oven, so you will want to remove them when they still feel soft in the middle but have firm edges. 
  • If you can’t have eggs, check out my 7 Best Egg Substitutes in Baking!

How To Store Them

These highly addicting brownies can be stored at room temperature for 4 days (if they last that long!). They also freeze well for up to 4 weeks and can be defrosted in your microwave. 

Sometimes we all need a peanut butter and chocolate fix to get us through the week. Don’t forget to try my Easy Peanut Butter No Bake Cookies, dipped in a healthy dose of rich melted chocolate, next! 

Get More Brownies!

And don’t forget to buy my Bigger Bolder Baking Cookbook!

Full (and printable) recipe below!

Ultimate Chocolate Peanut Butter Brownies Recipe

4.77 from 42 votes
Sometimes we all need a peanut butter and chocolate fix to get us through the week — and my Ultimate Chocolate Peanut Butter Brownies recipe does the trick.
Author: Gemma Stafford
Servings: 12 people
Prep Time 25 mins
Cook Time 55 mins
Sometimes we all need a peanut butter and chocolate fix to get us through the week — and my Ultimate Chocolate Peanut Butter Brownies recipe does the trick.
Author: Gemma Stafford
Servings: 12 people

Ingredients

  • 2 1/2 cups (20oz/565g) sugar
  • 1/2 cup (4floz/115ml) water
  • 2/3 cup (4oz/115g) bittersweet chocolate, roughly chopped
  • 4 large eggs*
  • 1 cup (8floz/225ml) flavorless oil
  • 2 teaspoons vanilla extract
  • 1 1/2 cups (7 1/2oz/213g) all-purpose flour
  • 2/3 cup (2 2/3oz/76g) unsweetened cocoa powder
  • 1/2 teaspoon baking powder
  • 1 teaspoon salt
  • 3/4 cup (6oz/170g) peanut butter, smooth
  • 1/3 cup (1 1/2oz/43g) peanuts, chopped

Instructions

  • Preheat the oven to 350°F (180°C). Butter and line an 8x8 - inch square cake pan, which is what I used for a deep brownie. This is a big batter. You can also bake this in a 13x9-inch pan too, but the time will change to 40 minutes- judge it to keep the jiggle!
  • In a medium microwavable bowl, combine the sugar, water, and chocolate. In the microwave or over a bain-marie heat this mixture gently until the chocolate has melted, roughly 2-3 minutes. Allow this mix to cool slightly.
  • Into the cooled chocolate mixture whisk in the oil, eggs, and vanilla.
  • In a separate bowl, sift together the flour, cocoa powder, baking powder, and salt.
  • Add the dry ingredients into the wet ingredients and mix until just combined, do not over mix.
  • Into the batter swirl in 1/2 cup of peanut butter leaving big streaks throughout.
  • Pour the batter into your prepared cake pan and finish by swirling in the remaining 1/4 cup of peanut butter on top and scattering over the chopped peanuts.
  • Bake for roughly 55-65 minutes. Always bake brownies a little under so that they remain fudgy on the inside.
  • Once baked allow to cool in the pan for 30 minutes before cutting them. Enjoy warm with vanilla ice-cream.
  • Cover and store at room temperature for up to 4 days. They also freeze really well for up to 4 weeks.

Recipe Notes

Egg Substitute: Check out my 7 Best Egg Substitutes in Baking

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Comments & Reviews

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Diane
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Diane
22 days ago

can you lower the sugar for the brownies?

Mila
Guest
Mila
12 days ago

Hi Gemma, is the sugar the right amount? I found it too sweet , the recipe for your best ever brownies has half the amount of sugar and they always turn out perfect.

Laurel
Guest
Laurel
20 days ago

Thank you for correcting in “what you’ll need” that it’s an 8×8” pan we need.

george
Guest
20 days ago

Hi Gemma. Love your recipes but I think I found a couple of errors in the recipe as follows: 1. 2-1/2 cups sugar (20 oz). Since sugar is dry shouldn’t this be 10 oz? 2. 2/3 cup bittersweet chocolate (4oz). Shouldn’t this be 3 oz? 3. 1-1/2 cup all-purpose flour (7-1/2 oz) Shouldn’t this be 6 oz: 4. 2/3 cup (2-2/3 oz) cocoa powder. Should this be 3 oz? 5. 3/4 cup peanut butter (6 oz). Shouldn’t this be 3 oz? My kids and grand kids are coming into town at the end of May and I would like to… Read more »

Nicola
Guest
Nicola
20 days ago

These brownies are absolutely delicious! I had to use gluten free flour, but they still came out perfectly. I needed a chocolate and peanut butter fix to get me through the week, and this was definitely it! Thank you for a great recipe!

boots
Guest
boots
20 days ago

Hey am interested in giving this recipe a try. You’ve given the metric conversion for all of the ingredients except for 1/2 tsp baking powder & 1 tsp Salt. If they are in US measurements, what would the metric conversion be? I wouldn’t bother but they’re both fairly important ingredients to get right.

Thank you,

Craig
Guest
Craig
20 days ago

Dear Gemma,
I just wanted to let you know that these Heavenly Brownies, were exactly that. My Mrs’s absolutely Loved them. So needless to say they were truly a hit. And I to thought that they were amazing, along with the rest of my family……😊😊😊…….

Sarah
Guest
Sarah
20 days ago

Hi Gemma
Love love love your blog ! Is there any chance I can bake this in a microwave ? If yes, how long ? And can I omit the chocolate and add extra cocoa powder? Thank you !

Nell
Guest
Nell
21 days ago

I find it interesting that you are concerned about the sugar in peanut butter and then add 2 1/2 cups of sugar?

Laurel
Guest
Laurel
21 days ago

In your “what you need” section it says 9×13” pan, but instructions for recipe says 8×8”. Which is correct?

About Us

Meet Gemma

About Us

Meet Gemma

Hi Bold Bakers! I’m Gemma Stafford, a professional chef originally from Ireland, and I want to help you bake with confidence anytime, anywhere! No matter your skills, I have you covered. Sign up for my FREE weekly emails and join millions of other Bold Bakers in the community for new recipes, baking techniques, and more every week!

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