I’m obsessed with peanut butter and have no shortage of peanut butter desserts in my recipe index. You guys know this already!
However sometimes the most frustrating part of baking with peanut butter is that the intensity of that distinct nutty taste is subdued with baking.
Unless you’re making my No Bake Peanut Butter Cheesecake or Peanut Butter Frosting, you just lose some of that peanutty goodness once it enters the oven.
Especially when you add another strong flavor like chocolate to the mix. So I took the challenge for making Peanut Butter Brownies that maintained the integrity of the peanut flavor even after baking.
I thought about just topping chocolate brownies with a PB frosting. But I wanted them to be ultra rich, fudgy, and slightly gooey. I wanted them to be like a peanut butter cup, but with brownie instead of solid chocolate enrobing the PB. Because this is how my mind works.
So I came to the conclusion that stuffing the brownies with peanut butter would do the trick. But how do you prevent the peanut butter from melting into the batter as it bakes and losing its distinct taste and texture?
Well you basically freeze a layer of peanut butter in advance of stuffing! Doing so gives you the best peanut butter has to offer.
I got the idea from Recipe Tin Eats, she did the same thing but with Nutella! So I took that technique and coupled it with PB and my favorite simple brownie base and the results were nothing short of mouthwatering.
Make sure you have a glass of cold milk handy when serving. These babies are so thick, rich, and fudgy they practically require it 🙂
Peanut Butter Stuffed Brownies Recipe Tips & Tricks
How to Stuff Brownies with Peanut Butter
This is the fun part of this recipe! To get the best peanut butter flavor AND texture, we basically melt down peanut butter, pour it into a parchment lined baking pan, then freeze it for 1 hour until we have a sheet of solid peanut butter.
Use enough parchment to create an overhang so that you can lift the sheet of peanut butter out of the pan and place it back in the freezer while you mix up the batter and pour half of it into the pan. Top the batter with the PB sheet then pour the remaining batter on top. Bake immediately!
Important: be sure to use conventional creamy peanut butter like Skippy or Jif. Any kind of “natural” peanut butter in which the oil separates won’t work in this recipe.
How to make fudgy brownies
A couple things in this recipe make the brownies ultra fudgy. First, there’s no shortage of butter. Second, I use an extra egg yolk to add even more richness.
You’ll also notice there’s no baking soda or baking powder in this recipe. That’s because we’re making fudgy rich brownies, not cake. Whisking the eggs vigorously for a full minute as the recipe instructs will add enough air to slightly leaven the brownies without creating a cakey texture.
Whatever you do, be sure not to accidentally over measure the flour and cocoa powder. For perfect measurements, weigh both ingredients with a digital kitchen scale.
If you don’t have one, then lightly spoon each ingredient into the measuring cup and sweep off the excess. This will prevent you from compacting too much into the cup and creating dry brownies.
What pan is best for baking brownies?
A square light colored reflective metal baking pan is always my go to for practically any brownie recipe. Metal (namely high quality heavy aluminized steel or anodized aluminum) conducts heat more quickly and efficiently than glass or ceramic pans.
Avoid metal pans that are darkly colored as they conduct heat too aggressively and will likely lead to burnt or dried edges.
If you must use a glass or ceramic pan please note that the texture of the brownies may become gummy or overly dense and they’ll likely take significantly longer to bake. You run the risk of the center never cooking through with glass or ceramic.
Are brownies supposed to be gooey in the middle?
I like my brownies to remain slightly gooey and soft in the middle. Especially these ones since they’re stuffed with peanut butter! However, they should still bake up so they’re safe to eat and solid enough to eat by hand once cooled and sliced. Make sure to allow your brownies to cool completely if they seem gooey. You can always let them cool, cut into squares, then nuke in the microwave if you want them so gooey they require a fork to eat.
How to store brownies?
Brownies can be stored in an airtight container at room temperature for up to 3 days or in the fridge for up to 5 days. They’ll become more like a thick fudge in the fridge. You can reheat the brownies in the microwave until they’re gooey again, if you’d prefer.
More Homemade Brownie Recipes
Peanut butter filling:
(336 grams) creamy conventional peanut butter
(142 grams) unsalted butter
(113 grams) semisweet baking chocolate, chopped
(200 grams) granulated sugar
large eggs plus 1 egg yolk
(64 grams) all-purpose flour
(25 grams) unsweetened cocoa powder, sifted
Make the peanut butter filling:
Place the peanut butter in a heat safe bowl and microwave for 20 to 30 seconds, or until pourable but not super hot.
Line a metal 8-inch square pan with parchment paper, leaving an overhang. Spread the peanut butter into an even layer in the pan. Freeze for 1 hour or until solidified. Use the parchment to remove from pan and return peanut butter sheet to freezer. Keep frozen while making the brownie batter.
Make the brownies:
Preheat oven to 350°Line the square pan again with parchment paper, leaving an overhang.
In a large microwave-safe bowl combine the butter and chocolate. Microwave in 30-second bursts, stirring between each burst, until the mixture is melted and smooth. Add the sugar to the hot butter mixture and whisk vigorously until combined. Allow to cool until just barely warm.
Add in eggs, yolk, and vanilla extract and whisk for about 1 minute, or until very well combined.
Use a rubber spatula to stir in flour, cocoa powder, and salt until just combined.
Pour half of the batter into prepared pan and smooth out. Carefully place the frozen peanut butter sheet over the batter. Pour remaining batter on top, covering completely.
Bake in the preheated oven for about 30 minutes, or until cooked through but still very slightly gooey in the center. Let cool in pan 30 minutes. Remove from pan and allow to cool for another 30 minutes before slicing and serving.
Brownies can be stored in an airtight container at room temperature for up to 3 days or in the fridge for up to 5 days.
Feel free to reduce the amount of peanut butter to 1 cup or 3/4 cup if you want less.