S’more Brownies
These s’mores frosted brownies are what happens when a super fudgy, chocolatey brownie meets your favorite campfire treat, no fire required! Rich, gooey brownies topped with a fluffy graham cracker frosting and finished with soft, melty marshmallows for that classic s’more’s vibe in bar form. They’re nostalgic and basically taste like summer nights wrapped in the fudgiest brownie you’ve ever had. Perfect for when you want s’mores, but also really want brownies!
Secret to a Crackly Top and a Fudgy Brownie
A big part of what makes these brownies so good is the thin, crackly top paired with an ultra-fudgy center, and it all comes down to how the eggs and sugar are mixed. Beating them together until the sugar fully dissolves and the mixture turns pale helps create that delicate crust while keeping the inside dense and soft. Once baked, the graham cracker frosting settles smoothly over the crackly surface, adding a cool, creamy layer that contrasts nicely with the rich chocolate underneath without soaking in or weighing the brownies down!
Another tip to keep just the right amount of air in your brownies is to switch from a whisk to a spatula and gently stir in the dry ingredients. This keeps your brownies dense, rich, and fudgy instead of opening the door to cakey brownies… yuuuckkk! (PSA: if you do love cakey brownies, I respect you—but this recipe is not for you.)
5 Other Ways to Top These Brownies
Try Oreo Frosted Brownies!
Try Gingerbread Frosted Brownies!
Why I Measure in Grams (and You Might Want To, Too)
If you’ve ever made the same recipe twice and gotten two totally different results, the measuring method is often the reason.
Professional bakeries almost always measure by weight, not volume. Measuring cups leave room for inconsistency—especially with ingredients that pack differently depending on how you scoop or pour them. A scale removes all of that guesswork.
One of the biggest offenders is sugar. Different sugars (and even the same sugar measured by different people) can vary wildly in volume, but 100 grams is always 100 grams. Measuring by weight gives you repeatable, bakery-consistent results and cuts down on extra dishes at the same time.
A food scale is one of the best (and most affordable) investments you can make for your kitchen if you love baking and want your recipes to turn out exactly the same every time.
Ingredients To Prepare
Before baking, take a few minutes to gather the ingredients below and to ensure that they are rich, fudgy, and perfectly toasty!
Once you have all of the ingredients ready to go, you’re officially set up for s’more brownie success. I always recommend measuring everything out ahead of time so the process is smoother, and you can focus on making the fudgiest s’more brownies possible!
S’more Brownies
Ingredients
- 1/3 cup butter
- 1 1/2 cup granulated sugar
- 2 eggs
- 1 egg yolk
- 2 tsp vanilla extract
- 1/2 cup vegetable oil
- 1 cup cocoa powder
- 1 cup All-Purpose Flour
- 1 tbsp corn starch
- 1/2 tsp baking soda
- 1/2 cup butter
- 1 1/2 cups powdered sugar
- 2 tbsp heavy cream
- 1 tsp vanilla extract
- 1/2 sleeve graham crackers 1/2 cup crushed graham crackers
- mini marshmallows
Method
- In a large bowl, mix together melted butter and granulated sugar until combined.
- Add eggs and vanilla extract. Whip until the mixture turns from yellow to off-white (this is the secret to that classic crackly brownie top!).
- Mix in the vegetable oil until fully incorporated.
- Fold in cocoa powder, all-purpose flour, cornstarch, and baking soda until the batter is mostly smooth (don’t overmix).
- Pour batter into a greased, parchment-lined square pan.
- Bake at 350°F for 28–30 minutes.
- Let brownies cool while you prepare the frosting.
- Beat butter on high speed for 3–4 minutes until light and fluffy.
- Add powdered sugar until thick and smooth.
- Mix in heavy cream and crushed graham crackers, then whip on high for 2 minutes.
- Finish with vanilla extract.
- Spread frosting over cooled brownies and top with mini marshmallows. (Optional: lightly toast the marshmallows!)
- Let brownies set for 20–30 minutes before slicing.
- Enjoy fresh or store in the fridge for up to 10 days.
