Let Me Tell You Why This Brownie Recipe Actually Matters
If you’ve ever had one of “those” weeks where you sort of want to scream into a pillow but instead you just whip up a tray of something ridiculously indulgent, Peanut Butter Stuffed Brownies are truly the prescription. Honestly, the first time I made these, it was supposed to be a nice gesture for a neighbor (her dog ate my mail, long story), but the smell of molten chocolate and melty peanut butter called to me like some sort of dessert siren. I kept… let’s just say, a ‘generous portion’ for myself. Oops. Ever since, it’s just been my go-to for when everything needs to feel a little softer around the edges. If I’m stressed, I bake them, and sometimes I eat them straight from the pan—no shame.
So, Why Even Bother Making These?
I pull this recipe out when I’m looking to cheer up a gloomy Tuesday or when my little nephew is coming over (he calls them “peanutty mud pillows”)! My family absolutely loses their minds for these, especially because the peanut butter layer is proper gooey. There was a brief, unfortunate phase where the peanut butter would sort of disappear into the brownie (what a tragedy), but after some tinkering, I cracked it—now it stays put, right in the middle. Plus, if you find yourself with a leftover jar and nothing but the end-of-loaf bread for sandwich options, this is a glorious second life for peanut butter. Bonus: you end up with fewer dishes than you’d think for something that’s basically a party in a pan.
What You’ll Need… Well, More or Less
- 1 cup (about 225g) unsalted butter—melted; I’ve used half salted in a pinch and just skipped the extra salt.
- 2 cups sugar (granulated is fine, but sometimes I’ll sub in a third with brown sugar for a chewier bit—it’s not a strict science)
- 4 large eggs
- 1 cup all-purpose flour—if I’m running low, I’ve made these with 3/4 cup plus a heavy tablespoon of cocoa powder and it’s just grand
- 3/4 cup good cocoa powder (but I promise, whatever you’ve got on hand works, just maybe skip anything labelled “Dutch process”… truth be told, my nan swore by supermarket brand)
- 1/2 tsp salt (skip if you already used salted butter, or you’re watching salty snacks…)
- 1 tsp vanilla extract (confession: sometimes I just tip the bottle and eyeball it)
- For the Stuffed Middle:
- 3/4 cup creamy peanut butter (don’t use the all-natural kind, it splits—Jif or Skippy do alright)
- 2 tbsp powdered sugar (once I forgot this and it was still edible, but runnier)
- Optional: a handful of chocolate chips or chopped salted peanuts for the top
How the Cookie—Err, Brownie—Crumbles
- First things first, set your oven to 350°F (175°C for the non-Americans—though honestly, some ovens are liars, so keep an eye). Line an 8×8-inch pan with parchment, but if you only have a 9-inch one just—lean in, it’ll be a bit thinner but who’s checking?
- Mix melted butter with the sugar in a big-ish bowl (this is honestly the step my arm dreads, but hey, it’s a workout). Whisk until it’s kind of glossy—ish.
- Add eggs one at a time, beating after each addition. If you get some shell in there, just fish it out like nothing happened (been there).
- Stir in flour, cocoa powder, and salt. Don’t overmix or they’ll turn into chocolate bricks; stop as soon as the batter comes together and you see no big streaks.
- Pour half the batter into your pan. This is where I sometimes doubt if it’s enough, but it works out.
- In a separate bowl, swirl together peanut butter and powdered sugar till it’s sort of like thick frosting. Plop it over the brownie layer in clumps (I use a butter knife—some folks swear by spoons, but I’ve never noticed a difference). Smooth a bit, but perfectionism is banned now.
- Spoon the rest of the brownie batter on top. Gently spread it over so the peanut butter is proper tucked in (and if it peeks out, all the better—no one in my house complains about extra peanut butter).
- If you want to be extra, scatter chocolate chips or crushed nuts on top—just a handful.
- Bake 32-38 minutes. Or until the edges look set and the middle has a faint jiggle—and yes, a toothpick might lie because of the gooey center, so don’t stress if it’s sticky.
- Cool at least 30 minutes (I mean, ideally), though I’ve sliced while still warm so the peanut butter’s like a river—totally OK by me.
Little Notes From Baking (The Truth, Warts and All)
- If you use natural peanut butter, it’ll separate and get a bit odd looking—I learned this the hard (and tragic) way
- They really do taste fudgier the next day, almost like they’ve been to a spa overnight, but—see below…
- You can freeze these if you layer them with wax paper; I’ve probably done it more times than I admit because I try not to eat them all in one go
Variants I’ve Messed With (And At Least One I Wouldn’t Repeat)
- Almond butter instead of peanut—it’s… fine? Just less punchy (in a good way, if peanut allergies are a thing for you)
- Marshmallow swirled in—turned into a sticky mess but tasted like a campfire exploded, which is sometimes what you want
- Once, I tried Nutella stuffed in, but actually, it just sort of disappeared—save Nutella for toast, I reckon
Stuff You’ll Need (Or, MacGyver It…)
- Big mixing bowl (a pot works if your bowls are all in the dishwasher)
- 8×8″ (20x20cm) baking pan, or 9″ square if that’s what you’ve got—just watch the baking time
- Parchment paper makes your life easier, but foil with some butter works when you’ve run out
- Wooden spoon or whisk (or even a clean hand if you’re feeling rustic—no judgment)
Let’s Talk Storage (Or: Why Bother, Honestly?)
Officially, these keep in an airtight container for 3-4 days. But in my house, 24 hours is a success story. If you do have leftovers by some wizardry, pop them in the fridge—great with coffee the following morning. And, like I said, you can freeze them for a few weeks, if you’re somehow made of stronger stuff than me.
How We Serve ‘Em Up (Family Rules, No Judging)
Cut big messy squares while they’re still warm, then plop a scoop of vanilla ice cream on top—my cousin insists on a drizzle of homemade hot fudge (I use this recipe when feeling extra, or when there’s too much snow outside to go to the shop). Or just cut tiny pieces and eat with fingers, leaning over the sink so the crumbs don’t attract ants… true story.
Lessons in Brownie Mishaps (Don’t Repeat My Mistakes)
- I once tried microwaving to speed up cooling. Regret. Peanut butter just oozed out everywhere—patience actually pays here (who knew?)
- Don’t overbake. Just trust a bit of jiggle means they’ll set as they cool—if you wait for a dry pick, you’ve gone too far. Learned that one the hard way after a tray of sad, cakey brownies.
- If you use too much peanut butter, it becomes a bit of a mess. Yeah, it sounds impossible but it’s not. Stick to the recipe. Or add a tiny bit less if you hate sticky fingers.
You Folks Asked, I Actually Answered
- Do I have to use parchment paper?
- Honestly, no! I’ve buttered the pan before and it worked, but be warned—corners stick sometimes.
- Can I double this recipe?
- Definitely! Just use a bigger pan, like 9×13, and maybe check it at 35 minutes (sometimes mine needs longer). I get distracted and forget sometimes… oops.
- What if I want them *super* fudgy?
- I underbake by about 2 minutes. Just saying! (But watch out, they’re a bit gooier… that’s the charm though, right?)
- Are there gluten-free options?
- I haven’t nailed a GF version. My friend tried with almond flour and said they were “pretty good,” but it’s not the same vibe. If you find a version that works—email me, please!
- Can I use crunchy peanut butter?
- It works, but the texture is chunkier—which I actually love, but my mother-in-law side-eyes it. Up to you!
- Is there a way to make them vegan?
- Honestly, probably. I read about flax egg swaps (check out this how-to), but I haven’t tested it—yet!
Oh, bit of a tangent, but if you ever find yourself in northern England, try the brownies at that tiny cafe in Keswick (can’t remember the name, but it’s between the walking gear shops). Nobody will tell you their peanut butter trick but I swear it’s magic.
So next time life gets twisty, or you just fancy a tray of something that soothes the soul, give these a go. Brownies stuffed with peanut butter fix almost everything—I’ll stick by that.
Ingredients
- 1 cup unsalted butter, melted
- 2 cups granulated sugar
- 4 large eggs
- 1 tsp vanilla extract
- 1 cup all-purpose flour
- 1 cup unsweetened cocoa powder
- 1/2 tsp salt
- 1 cup creamy peanut butter
- 1/2 cup powdered sugar
Instructions
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1Preheat oven to 350°F (175°C). Line a 9×9-inch baking pan with parchment paper.
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2In a large bowl, whisk together melted butter and granulated sugar until smooth. Beat in eggs one at a time, then add vanilla extract.
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3In a separate bowl, mix flour, cocoa powder, and salt. Gradually fold dry ingredients into the wet mixture until just combined.
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4In a small bowl, mix peanut butter and powdered sugar until creamy.
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5Pour half of the brownie batter into the prepared pan. Drop spoonfuls of the peanut butter mixture over the batter, then spread gently. Cover with remaining brownie batter.
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6Bake for 30-35 minutes, or until a toothpick inserted comes out mostly clean. Cool completely before slicing and serving.
Approximate Information for One Serving
Nutrition Disclaimers
Number of total servings shown is approximate. Actual number of servings will depend on your preferred portion sizes.
Nutritional values shown are general guidelines and reflect information for 1 serving using the ingredients listed, not including any optional ingredients. Actual macros may vary slightly depending on specific brands and types of ingredients used.
To determine the weight of one serving, prepare the recipe as instructed. Weigh the finished recipe, then divide the weight of the finished recipe (not including the weight of the container the food is in) by the desired number of servings. Result will be the weight of one serving.
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