This s'mores brownie recipe is the best smores dessert! Layers of buttery graham cracker crust, fudgy brownies, smooth chocolate, and toasted, gooey marshmallow fluff!
Line the bottom and all sides of a 9x9 baking pan with heavy-duty aluminum foil, and spray lightly with cooking spray.
Combine graham cracker crumbs, melted butter, and sugar in a bowl. Stir well to coat.
Press crust mixture into the bottom of the prepared pan and set aside.
Brownie Layer
Preheat oven to 350°F.
Whisk together melted butter, eggs, sugars, and vanilla until smooth.
Sift in cocoa powder, flour, and salt and fold into wet ingredients until just combined.
Spread batter onto graham cracker crust in pan and smooth the top.
Bake for 25-30 minutes or until center is set.
Just after removing pan from the oven, add chocolate chips to the top and allow to melt. Spread chocolate in an even layer over warm brownies. Let brownies cool completely (I place mine in the fridge to be sure they're cooled).
Marshmallow Layer
Spoon marshmallow fluff onto chocolate layer and spread evenly.
Broil on high for 2 minutes or until top of marshmallow fluff is lightly browned (see note). You can also toast the marshmallow layer with a culinary torch.
Chill again to firm up marshmallow layer, then cut and serve! Store leftovers in refrigerator.
Video
Notes
Eggs: This smokes brownie recipe is based on my Triple-Chocolate Pecan Brownies, but only uses 2 eggs to make a fudgier, denser brownie layer and make a little extra space in the pan for our marshmallow layer. If you prefer a texture that's slightly more cakey, add in the third egg!Spreading and slicing marshmallow fluff: I would suggest having a damp cloth on hand to wipe down your offset spatula each time you spread your marshmallow fluff. It makes it easier to spread it neatly without getting it everywhere! And the same goes for when you slice your brownies to serve -- be sure to wipe your knife with a damp cloth between each cut!Broiler safety: Be sure to watch the pan constantly while using the broiler. Marshmallow can easily catch fire, so place your pan on a center rack so that it's far enough away from the heat source. Once you see the marshmallows start to smoke, it's time to take them out! In general, use an abundance of caution anytime you're using the broiler.Storage and Freezing: These brownies should be stored in the fridge to keep the marshmallow layer fluffy, and should be served chilled or at room temperature. I like them straight out of the fridge, because the marshmallow is still gooey but the chocolate layer is a little crunchy!They can also be frozen in an airtight container for up to 2 months.