If you’re craving an indulgent treat that’s both easy to make and packed with peanut butter chocolate goodness, you’re in for a serious delight. The ULTIMATE One Bowl Reese’s Brownie Recipe is exactly what it sounds like—fudgy, rich brownies with whole Reese’s Peanut Butter Cups and crispy Reese’s Pieces baked right inside, all made in one simple bowl. Trust me, this recipe has quickly become a staple in my kitchen because it’s effortless, mess-free, and the results? Totally fan-freaking-tastic.

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Why You’ll Love This Recipe

One Bowl Wonder: No fancy equipment or extra bowls—everything comes together in just one bowl, saving you time and cleanup.
Peanut Butter Meets Chocolate Bliss: The mix of peanut butter chips, mini Reese’s Cups, and Reese’s Pieces delivers layered flavors and textures that are absolutely addictive.
Perfectly Fudgy & Moist: Thanks to vegetable oil and the right baking time, these brownies come out moist and just fudgy enough without being cakey.
Kid and Crowd-pleaser: Whether it’s a party or just a cozy night in, these brownies always disappear fast—my family goes crazy for them!

A close-up view of a stack of three chocolate brownies on a white marbled surface, each square showing a rich, dark brown texture mixed with crunchy walnut pieces inside. The top brownie has bright orange, yellow, and brown candy-coated chocolates scattered on the top surface, adding colorful spots of smooth, glossy texture. The middle brownie is bitten to reveal a gooey caramel layer mixing with the dark chocolate base and nuts inside, while some of the candy pieces peek out from the edges. Around the brownies are loose orange, yellow, and brown candy-coated chocolates, adding extra color to the scene. photo taken with an iphone --ar 4:5 --v 7

Ingredients You’ll Need

The ingredients here are pretty straightforward, but they work beautifully together to create that classic Reese’s brownie magic. Using unsweetened cocoa powder ensures a deep chocolate flavor without overwhelming sweetness, and the peanut butter chips add those little nutty bursts throughout.

All Purpose Flour: The base for structure; be sure to spoon and level to avoid dry brownies.
Unsweetened Cocoa Powder: I use Dutch-processed for smoother, richer flavor, but natural works too.
Granulated Sugar: This balances the cocoa’s bitterness and keeps the brownies chewy.
Salt: A pinch enhances all the chocolate and peanut butter flavors.
Large Eggs: They bind everything together and add moisture; room temperature eggs mix better.
Vegetable Oil: Keeps the brownies incredibly moist and fudgy compared to butter.
Peanut Butter Chips: These melt slightly to create pockets of peanut butter yum.
Miniature Reese’s Peanut Butter Cups: I leave these whole for the surprise bites, but chopping is an option.
Reese’s Pieces: They add vibrant color and a little crunchy texture on top.

Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

Variations

I’m all about making recipes your own, so I love to mix up The ULTIMATE One Bowl Reese’s Brownie Recipe depending on the mood or occasion. You can easily tweak it to fit dietary needs or just to experiment.

Nut-Free Version: I’ve swapped the peanut butter chips and Reese’s for chocolate chips and mini M&Ms successfully—great for kids with allergies!
Extra Chewy: Using half vegetable oil and half melted butter adds a different richness and chewiness I like on chillier days.
Chunky Mix-Ins: Try folding in chopped roasted peanuts or even swirls of peanut butter for extra texture.
Gluten-Free: I’ve had success replacing flour with a 1:1 gluten-free baking flour blend without sacrificing texture.

How to Make The ULTIMATE One Bowl Reese’s Brownie Recipe

Step 1: Prep Like a Pro

First things first—preheat your oven to 350°F and line a 9×13” pan with foil, making sure to leave some overhang for easy removal later. Don’t forget to coat it with nonstick spray; this step guarantees your brownies won’t get stuck and make life easier when it’s time to slice and serve.

Step 2: Whisk Dry Ingredients

Grab a large bowl and whisk together the all-purpose flour, unsweetened cocoa powder, sugar, and salt until they’re evenly combined. This helps prevent any lumps and ensures every bite has uniform chocolate goodness. I find sifting isn’t necessary here but you can if you want a smoother texture.

Step 3: Add Wet Ingredients and Mix

Now, crack in the eggs and pour the vegetable oil over the dry ingredients. Stir gently but completely until you get a glossy batter with no streaks of flour. A wooden spoon or sturdy spatula works best here. Resist the urge to overmix because that can make brownies tough.

Step 4: Fold in the Peanut Butter Chips

Stir in the peanut butter chips next—they’ll soften and melt slightly during baking, giving you these ridiculously delicious peanut butter pockets. Try not to overwork the batter here to keep them intact.

Step 5: Layer the Batter and Reese’s

Spoon half of the batter into your prepared pan and spread it evenly. Now for the fun part: place the miniature Reese’s Peanut Butter Cups right on top. I like to leave them whole for those epic peanut butter bursts, but chopping them makes for better distribution. Cover them with the rest of the batter, smoothing the top, and then scatter the Reese’s Pieces over—it’s such a fun pop of color and crunch.

Step 6: Bake to Perfection

Bake for about 20-26 minutes. You want to pull them out when the brownies just stop jiggling in the center—this little wobble means fudgy perfection. Don’t overbake or you risk dry edges. When cool, use the foil overhang to lift the whole slab out for easy slicing.

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Pro Tips for Making The ULTIMATE One Bowl Reese’s Brownie Recipe

Skip the Mixer: I always mix by hand to avoid overworking the batter, resulting in more tender brownies.
Use Room Temperature Eggs: This little trick helps everything blend smoothly without clumps or weird textures.
Reese’s Placement: I learned that pressing the peanut butter cups slightly into the batter keeps them from sinking during baking.
Watch the Bake Time: Testing with a slight jiggle is crucial—you want that fudgy center, so avoid the toothpick test here.

How to Serve The ULTIMATE One Bowl Reese’s Brownie Recipe

A close-up of three stacked chocolate brownies filled with peanut butter pockets and topped with colorful candy pieces in bright orange, yellow, and brown. Each brownie has a rich, dark brown base with visible swirls of creamy peanut butter creating light brown patches inside. The top layer is scattered with shiny candy coating pieces in vibrant colors, adding texture and brightness. Around the bottom brownie, scattered chocolate and peanut butter candies rest on a wooden surface with a white marbled background softly blurred behind. The focus shows the gooey middle layers and crunchy candy toppings clearly. photo taken with an iphone --ar 4:5 --v 7

Garnishes

I love sprinkling a few extra Reese’s Pieces on top right after baking for a colorful finish. Sometimes, a dusting of powdered sugar or a drizzle of melted chocolate amps up the presentation if I’m serving these at a get-together.

Side Dishes

These brownies pair beautifully with a scoop of vanilla ice cream or a simple dollop of whipped cream. For a contrast, a cold glass of milk or a cup of bold coffee balances the sweetness perfectly.

Creative Ways to Present

For parties, I like to cut the brownies into bite-sized squares and stick a small toothpick in each piece—makes them super sharable. Another fun idea I tried was layering this brownie base in a trifle with whipped cream and chopped Reese’s bits for a show-stopping dessert parfait.

Make Ahead and Storage

Storing Leftovers

Once fully cooled, I store these brownies in an airtight container at room temperature, and they stay moist and delicious for up to 3 days. The foil lining really helps for easy clean-up and lifting them into containers.

Freezing

I freeze brownies all the time for busy weeks. I wrap individual portions tightly in plastic wrap and place them in a freezer bag. When you’re ready, just thaw at room temperature for a couple of hours or overnight in the fridge.

Reheating

Reheating is simple—pop a brownie in the microwave for 15-20 seconds, and you’ll be greeted with warm, melty peanut butter chocolate heaven. If you want the edges crispier, a short stint in an oven at 300°F works beautifully without drying them out.

FAQs

Can I use salted butter instead of vegetable oil in The ULTIMATE One Bowl Reese’s Brownie Recipe?

While vegetable oil keeps the brownies moist and fudgy, you can try substituting melted salted butter for a more buttery flavor. Just keep in mind this might make the texture slightly denser and less tender. Also, reduce or omit the added salt if using salted butter.
Do I have to use the miniature Reese’s Peanut Butter Cups whole?

Nope! I usually leave them whole for those fun, gooey bites, but feel free to chop them up if you want the chocolate and peanut butter spread more evenly throughout the brownies. Both ways taste fantastic.
How do I know when The ULTIMATE One Bowl Reese’s Brownie Recipe is perfectly baked?

Look for a slight jiggle in the center when you gently shake the pan. You don’t want it completely set because these brownies taste best with a fudgy interior. Avoid the toothpick test here—it tends to give a false impression.
Can I make this recipe dairy-free?

Since this recipe uses vegetable oil and eggs, it’s naturally dairy-free aside from the peanut butter chips and Reese’s. Look for dairy-free peanut butter chips and dairy-free Reese’s or substitute with dairy-free chocolate chips to make it work.

Final Thoughts

I absolutely love how this recipe brings everyone to the kitchen and how easy it is to whip up on a busy day or for a special occasion. When I first tried The ULTIMATE One Bowl Reese’s Brownie Recipe, I was hooked by the rich peanut butter pockets and simple prep. Whether you’re treating yourself or impressing guests, I promise you’ll enjoy every fudgy, peanut buttery bite. Give it a go—you’ll thank me later!