With a graham cracker base, a chewy brownie layer and a thick layer of marshmallow frosting, these S’mores Brownies would be perfect for your summer BBQ or picnic!
My daughter is newly home for the summer after her first year of college and it’s great to have her home! She had a very successful first year away from home and she cooked for herself all year, too. The one thing she didn’t do much of though was baking and so she has a lot of pent-up baking need – both making it and eating it! Yes, the apple doesn’t fall far from the tree and my daughter has definitely inherited my sweet tooth and especially any sweets that involve chocolate.
So I thought I’d make her up a welcome home treat. These S’mores Brownie Bars were a big hit and I thought I’d share them, as they would be perfect to take to a summer BBQ, picnic or potluck. They can be made ahead and keep really well. They also cut beautifully, so they are sturdy enough to be eaten out of hand.
I was pleasantly surprised at how well the marshmallow frosting held up. I stored the pan on the counter uncovered on top, but with a bit of plastic wrap hugging the cut side to keep them from drying out. By day 2, the topping had tightened up a bit, but was still soft and creamy. So definitely don’t worry about making these in the morning for an evening event.
You can make these in either an 8-inch or 9-inch square pan. Obviously the layers will be a tiny bit thinner in a 9-inch, but will still be in proportion for good balance. Also note that the the baking time will be a bit different as a result, so do watch near the end of the baking time. Be sure not to over-bake the brownie layer. A tester should come out moist with a few crumbs.
Get the Recipe: S'mores Brownies
For the Graham Base:
- 2 1/2 cups (210 ml) graham cracker crumbs
- 1 1/2 Tbsp. (18 g) packed brown sugar
- Pinch salt
- 10 Tbsp. + 2 Tbsp (144.84 g) unsalted butter, melted
For the Brownie Layer:
- 1/2 cup (113.5 g) unsalted butter
- 4 oz. (113.4 g) unsweetened chocolate
- 1 1/2 cups (300 g) granulated white sugar
- 1/4 tsp. (1.5 g) table salt
- 2 tsp. (8.4 ml) vanilla
- 2 (2) large eggs, at room temperature
- 1 cup (125 g) all-purpose flour
- 2 Tbsp. (10.8 g) cocoa powder
- 4 large (4) egg whites, at room temperature
- 1 cup (200 g) granulated white sugar
- 1/4 tsp. (0.75 g) cream of tartar
- Pinch fine salt
- 1 tsp. (4.2 ml) vanilla extract
- Preheat oven to 350° F. Spray an 8 or 9-inch square baking pan and line with a piece of foil or parchment paper, allowing a couple of inches of over-hang on two sides.
- For the Graham Base: Combine cracker crumbs, brown sugar and salt in a medium bowl and stir. Add melted butter and stir together until cracker crumbs are coated in butter. Gently press mixture into prepared pan and bake in the pre-heated 350° F. oven for 8-10 minutes. Set aside to cool completely before proceeding.
- For the Brownie Layer: Melt the butter and chocolate together in a medium metal bowl set over a pan of simmering water (don’t let the bowl touch the water). *Or do this in the microwave, if you prefer.
- Let the chocolate cool slightly before stirring in the sugar, salt and vanilla. Add the eggs one at a time, stirring each time until blended. Add the flour and cocoa and beat until the mixture is smooth, 30-60 seconds. Batter will be thick. Scrape the batter on top of the cooled graham cracker base and smooth top. Bake in pre-heated 350° F. oven until the top is uniformly coloured, with no indentation and a toothpick inserted in the middle comes out almost clean, with a few moist crumbs clinging to it, about 22-28 minutes. Set aside to cool completely before proceeding.
- To make the Marshmallow Topping: Fill a medium saucepan with 1 inch of water and bring it to a simmer over medium heat.
- Place the egg whites, sugar, cream of tartar, and salt in a clean metal or glass bowl, then place the bowl over the saucepan, making sure the bottom of the bowl is not touching the water. Heat the egg white mixture, whisking constantly, until the sugar has dissolved and the mixture is hot to the touch (about 120° F. on an instant-read thermometer), about 3-5 minutes.
- Transfer the mixture to a stand mixer fitted with the whisk attachment or beat with a hand mixer in the same bowl. Turn the mixer to medium and whisk for 1 minute. Increase the speed to high and whisk until stiff, glossy peaks form, about 5 minutes more. Add the vanilla and whisk until just incorporated, about 1 minute.
- Spoon marshmallow topping over cooled brownie layer and spread to cover top, swirling to make a decorative pattern.
- To brown marshmallow topping, use a kitchen torch or remove from baking pan, fold down overhang sides then place on a baking sheet. Broil in oven until lightly golden (best done 10-12 inches from the broiler element - not too close, so it doesn't scorch)
Ok these are officially the GREATEST things ive ever made, my kids cant get enough!
So glad you are all enjoying them! Thanks :)
Oooh – Jennifer! You combined two of my favourite desserts into one dreamy-looking dessert bar! I can’t wait to whip up a batch of these and indulge!
Thanks so much, Stephanie. They were a great indulgence :)
Ok thank you!
these look fabulous! I was going to make them for a party tomorrow. Would they be ok if I made them tonight & stored in the fridge or do I need to leave them out at room temp lightly covered? Thank you! Have a happy Memorial Day!!
Thanks Jennifer. I know someone else mentioned refrigerating, but I had great luck at room temperature. You could cover loosely, but definitely do the toothpick thing to rise it up, so the plastic wrap doesn’t touch the frosting, as it will stick if it touches at all.
I made these for a Memorial Day potluck at my work today, and they were absolutely amazing! I baked the crust 2 nights before, and then the actual bars the night before the event and they held up great. I did refrigerate it overnight, though. The bars themselves were fantastic, and tasted just like a s’more! My favorite part was the marshmallow. I was getting compliments all day. Thank you for sharing this great recipe.!
So glad you enjoyed them, Jenny. Happy Memorial Day :)
Such pretty bars, I love that toasted marshmallow topping!
Thanks Laura. It was so creamy. Loved it!
Oh no you didn’t! These are SO up my alley. I’m jealous of your daughter’s homecoming, Jennifer!
Thanks Sarah! These were a great treat for some late-night sweet sharing with my girl :)
My oldest daughter has just come home from university, and she shares my sweet tooth! She’d be thrilled if I whipped up a batch of these for her.
They would, Beth. No matter how old they get, it’s nice to treat them, isn’t it?! :)
OMG just looking at that layer of marshmallow I am ready to bake a pan of these and take them with me in bed, cuddle and watch movies, cry, laugh, eat, repeat.
Thanks so much, Katalina and these would be perfect for that :)
What a sweet welcome home! This is breathtaking, Jennifer. I have a soft spot for s’mores!
Thanks so much, Liren. We really enjoyed digging in to these together :)
This looks divine, and that marshmallow frosting is heavenly! This is most certainly a crowd pleaser. I’ve got to try it out! Pinning.
Thanks so much, Thao and thanks for pinning :)
Ahhh! These look to die for :) The marshmallow topping looks really good!
Thanks Sarah. The topping was really delicious!
These look fantastic! Great summer dessert!
Thanks so much, Renee :)
Wow these are a thing of beauty! How fun to have your daughter home – I bet you both bake up some amazing treats this summer. I can see a lot of happy people if I brought these to a party! Absolutely gorgeous!
Thanks Tricia. Loving having our daughter home, but she’s definitely a bad influence on me in the sweets department, so there will definitely be lots of baking :)
Wow, those look awesome!! Love the toasted meringue, looks absolutely perfect :)
Thanks so much, June :)
Jennifer these look FABULOUS!! A summer must make!!
Thanks so much, Mary Ann :)
These are eye-popping! They literally glow!! I bet you are so happy to have your daughter home, it looks like it’s going to be a SWEET summer :)
Thanks Sue and yes, there will be no shortage of sweets this summer, for sure :)
These will be on my summer to-do list for sure Jennifer. They sound and looks wonderful. I know it’s just great to have your daughter home for the summer. I remember that was always a bit of an adjustment but such a special time as well. Have fun! And keeping making good stuff like this and sharing it with us :)
Thanks so much Chris and yes, definitely a period of adjustment happening for all of us ;)
These are genius! Such a clever idea and the photos tell the tale! You must be over the moon to have your daughter home. Mine is mid way through high school and I can’t imagine being with her every day. With treats like these, yours may stay home for college year #2!
Thanks Toni. She’s certainly enjoying having Mom doing the cooking again :)
Oh you are going to have such a fun summer with your daughter. Yeah! I love these brownies. I was just toasting up some marshmallows this morning for a recipe because I’m getting in the mood for s’mores. ‘Tis the season. Yeah!
Thanks Liz and yes, she is my partner-in-crime :) Yay for s’mores season, too!