Sweet treats like this are the best. This S’mores Casserole takes just three simple ingredients to turn the classic campfire favorite into an easy oven-baked dessert. If you love gooey chocolate and toasted marshmallows, this will quickly become a go-to recipe.
This s’mores casserole captures all the summer flavors you expect from a s’more: crunchy graham crackers, melted chocolate and a blanket of gooey marshmallows. The prep takes just a couple of minutes, and the bake time is short, so it’s perfect for when you want s’mores without a campfire. Keep this recipe handy for an easy indoor s’mores dessert any time of year.
I love this version because it’s essentially an indoor s’mores dip—rich chocolate chunks, melted marshmallows, and a graham base that’s perfect for dipping. The textures and flavors combine into a truly irresistible dessert.
Ingredients
Graham crackers – Use your favorite variety. Regular graham crackers work well, but honey or cinnamon varieties add a nice twist.
Mini marshmallows – If you can’t find minis, chop larger marshmallows into smaller pieces; kids can help with this step.
Milk chocolate (Hershey bars or similar) – Chop a chocolate bar into pieces or substitute chocolate chips, white chocolate, or dark chocolate if you prefer.
How to make this S’mores Casserole
Step One: Preheat the oven to 350°F (175°C). Spray an 8×8-inch baking pan with nonstick cooking spray.
Step Two: Crush three sheets of graham crackers into fine crumbs and spread them in an even layer across the bottom of the prepared pan.
Step Three: Evenly scatter the mini marshmallows over the graham cracker crumbs, then sprinkle the chopped chocolate pieces on top of the marshmallows.
Step Four: Bake for 7–9 minutes, until the marshmallows are gooey and the chocolate is melted. If you want a toasted top, briefly place the pan under the broiler for one to two minutes—watch closely so the marshmallows don’t burn.
Top Tip
Broil for a minute or two to get golden-brown marshmallow tops, but stay near the oven—they can go from perfect to burnt quickly.
Step Five: Break the remaining graham crackers into pieces for dipping, then serve by sticking them into the warm casserole to scoop up the melted chocolate and marshmallow.
Storage: Store at room temperature for up to a week. Once the chocolate sets, you can cut the casserole into bars instead of serving it as a dip.
Variations
Chocolate chips: Use semi-sweet, milk, white or dark chocolate chips instead of chopped candy bars for a different texture and flavor.
Extra toppings: Drizzle hot fudge, caramel, or nut butter over the finished casserole. Serve over vanilla ice cream for an indulgent sundae.
S’mores cookie bars: Press chocolate chip cookie dough into the pan and bake. During the last five minutes, add marshmallows, chocolate and graham crumbs on top, then finish baking or broil briefly to toast.
Peanut butter twist: Swap in peanut butter cups for a peanut butter s’mores version.
Common Questions
Can I use large marshmallows?
Yes. Large marshmallows will also melt, but they create bigger, chewier pockets of marshmallow in the casserole. If you prefer smaller pieces, cut large marshmallows in half before baking for easier dipping.
Can I make s’mores nachos with this recipe?
Absolutely. Spread graham crackers on a plate, top with melted marshmallows and chocolate, and pick up pieces to eat—same flavors, different presentation.
Can I make this gluten-free?
Yes. Use gluten-free graham crackers; marshmallows and chocolate are typically gluten-free, but always check labels to be sure.
Recipe (serves 8)
- 9 sheets graham crackers, divided
- 2 cups mini marshmallows
- 1 cup chopped milk chocolate (about 1 Hershey bar or equivalent)
Instructions
- Preheat oven to 350°F. Spray an 8×8-inch pan with cooking spray.
- Crush 3 sheets of graham crackers into crumbs and press into the bottom of the pan.
- Top with mini marshmallows, then sprinkle with chopped chocolate.
- Bake 7–9 minutes until marshmallows are gooey and beginning to brown. Broil briefly if desired to toast the tops.
- Separate the remaining graham crackers into pieces for dipping and serve while warm.
Nutrition (per serving, approximate): 217 kcal, 35 g carbs, 2 g protein, 9 g fat.
