There’s something incredibly satisfying about biting into a rich, fudgy brownie topped with gooey marshmallow fluff and chunks of Reese’s chocolate. These Reeses Marshmallow Brownies are the perfect treat for those who want to elevate their dessert game to a whole new level. With a simple brownie mix as the base, combined with creamy peanut butter, crispy rice cereal, and halved Reese’s miniatures, this recipe is not only easy but also brings together delightful flavors and textures that will make your taste buds sing. Let’s dive right in!
The Upside of Reeses Marshmallow Brownies

Imagine the soft, chewy brownie base harmonizing with the sweet, fluffy marshmallow topping and the irresistible crunch of crispy rice cereal. The addition of Reese’s miniatures adds a touch of chocolatey goodness that no one can resist. These brownies are perfect for any occasion—be it a cozy night in, a birthday celebration, or a potluck with friends. Plus, they’re a guaranteed crowd-pleaser that will leave everyone asking for seconds!
The Essentials
To create these mouthwatering Reeses Marshmallow Brownies, you’ll need the following ingredients:
- 18 ounces brownie mix
- Ingredients needed to prepare the brownie mix (typically water, oil, and eggs, check your mix’s instructions)
- 7 ounces marshmallow crème or fluff
- 25 Reese’s miniatures, halved
- 12 ounces semi-sweet chocolate chips
- 1 cup creamy peanut butter (do not use natural)
- 3 cups crispy rice cereal
Appliances & Accessories
Before you start baking, gather these essential tools:
- 9×13-inch baking dish: Perfect for a thicker brownie layer.
- Mixing bowls: For combining your ingredients.
- Spatula: Great for spreading the brownie batter and marshmallow fluff.
- Measuring cups and spoons: To ensure accurate ingredient measurements.
- Microwave-safe bowl: For melting the peanut butter and chocolate chips.
Reeses Marshmallow Brownies: From Prep to Plate

Step 1: Preheat Your Oven
Preheat your oven to 350°F (175°C). This is the ideal temperature for baking brownies, ensuring they cook evenly without becoming too dry.
Step 2: Prepare the Brownie Mix
In a large mixing bowl, combine the 18 ounces of brownie mix with the required ingredients (usually water, oil, and eggs) as per the package instructions. Stir until just combined, being careful not to overmix.
Step 3: Bake the Brownies
Pour the brownie batter into a greased 9×13-inch baking dish, spreading it evenly. Bake in the preheated oven for about 25-30 minutes or until a toothpick inserted in the center comes out with a few moist crumbs.
Step 4: Prepare the Marshmallow Layer
While the brownies are baking, in a separate bowl, mix the 7 ounces of marshmallow crème or fluff with the creamy peanut butter until smooth and fully combined.
Step 5: Add the Chocolate Chips
Once the brownies are done baking, remove them from the oven and sprinkle the 12 ounces of semi-sweet chocolate chips over the top. Allow them to sit for a few minutes to melt slightly.
Step 6: Spread the Marshmallow Mixture
Using a spatula, spread the peanut butter-marshmallow mixture evenly over the melted chocolate chips. Top with the halved Reese’s miniatures, pressing them gently into the marshmallow layer.
Step 7: Prepare the Crispy Rice Cereal Topping
In a medium bowl, combine the 3 cups of crispy rice cereal with a little extra melted peanut butter if desired for added flavor. Mix until the cereal is evenly coated.
Step 8: Top and Final Bake
Sprinkle the crispy rice cereal mixture over the marshmallow layer. Return the brownies to the oven for an additional 10-15 minutes. Watch closely to ensure the marshmallow doesn’t burn.
Step 9: Cool and Cut
Once baked, remove from the oven and let the brownies cool completely in the baking dish. Once cooled, cut them into squares and serve.
Make It Your Way

These Reeses Marshmallow Brownies are incredibly versatile. Here are some ideas to customize your creation:
- Add crushed nuts for extra crunch.
- Use flavored marshmallow fluff, like chocolate or strawberry.
- Substitute with white chocolate chips for a different twist.
- Drizzle caramel sauce over the top for added sweetness.
What I Learned Testing
- Using creamy peanut butter instead of natural makes a significant difference in texture.
- Letting the marshmallow mixture sit for a few minutes before spreading ensures it’s easier to work with.
- Adding the crispy rice cereal as a topping not only enhances the texture but also gives the brownies a fun crunch.
Save for Later: Storage Tips
To keep your Reeses Marshmallow Brownies fresh, follow these simple storage tips:
- Store in an airtight container at room temperature for up to 3-5 days.
- For longer storage, freeze individual squares wrapped in plastic wrap and then in aluminum foil. They can last up to 3 months in the freezer.
- To enjoy, simply thaw at room temperature or warm them slightly in the microwave.
Reader Q&A
Can I use a homemade brownie recipe instead of a mix?
Absolutely! Feel free to use your favorite homemade brownie recipe, just ensure it has a similar consistency to a boxed mix.
What if I can’t find marshmallow fluff?
You can make your own by whipping marshmallows with a little corn syrup and vanilla extract until fluffy, or try substituting with whipped cream if you’re in a pinch.
Can I make these brownies gluten-free?
Yes, simply use a gluten-free brownie mix, and you’ll have delicious gluten-free Reeses Marshmallow Brownies.
How do I cut the brownies cleanly?
To achieve clean cuts, use a sharp knife and clean it between cuts. You can also warm the knife slightly to help slice through the marshmallow layer.
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Bring It to the Table
These Reeses Marshmallow Brownies are not just a dessert; they are an experience. With their sweet, creamy, and crunchy elements, they are sure to be a hit at any gathering. Whether you’re sharing them with friends or enjoying them solo, each bite is a delightful treat that’s worth savoring. Don’t wait too long to whip up a batch of these delectable brownies; your taste buds will thank you!

Reeses Marshmallow Brownies
Ingredients
- 18 ounces brownie mix
- 1 each water, oil, and eggs to prepare the brownie mix
- 7 ounces marshmallow crème or fluff
- 25 each Reese's miniatures halved
- 12 ounces semi-sweet chocolate chips
- 1 cup creamy peanut butter do not use natural
- 3 cups crispy rice cereal
Instructions
- Preheat your oven to 350°F (175°C).
- In a large mixing bowl, combine the brownie mix with the required ingredients as per the package instructions. Stir until just combined.
- Pour the batter into a greased 9x13-inch baking dish and bake for about 25-30 minutes or until a toothpick comes out with a few moist crumbs.
- In a separate bowl, mix the marshmallow crème with the creamy peanut butter until smooth.
- Remove brownies from the oven and sprinkle chocolate chips over the top. Let them melt slightly.
- Spread the peanut butter-marshmallow mixture evenly over the melted chocolate chips and top with halved Reese's miniatures.
- Combine the crispy rice cereal with extra melted peanut butter if desired. Mix until evenly coated.
- Sprinkle the crispy rice cereal mixture over the marshmallow layer and return to the oven for an additional 10-15 minutes.
- Let the brownies cool completely in the baking dish before cutting into squares.
Equipment
- 9x13 inch Baking Dish
- Mixing bowls
- Spatula
- Measuring cups and spoons
- Microwave-safe Bowl
Notes
- Store brownies in an airtight container at room temperature for up to 3-5 days.
- For longer storage, freeze individual squares wrapped in plastic wrap for up to 3 months.
- Thaw at room temperature or warm slightly in the microwave before serving.
