Bailey’s S’mores Brownies

It seems like s’mores recipes are generally shared in the summer, but s’mores always feel like more of a fall treat to me. Cool, crisp, fall weather is perfect for cozying up with a blanket and hot chocolate (with Bailey’s, of course) around a fire and roasting marshmallows! But I can’t make a fire in the middle of downtown Boston, so I have to come up with some alternative options to get my s’mores fix. These Bailey’s S’mores Brownies are the perfect touch to a cozy night.

Top down view of the toasted marshmallow top of Bailey's S'mores Brownies, with one brownie turned sideways to see the three layers - the light brown graham cracker crust, the dark brown brownie in the center, and the white marshmallow topping

How to make the graham cracker crust

Combine graham cracker crumbs, sugar, and butter until well-combined and the crumbs are fully moistened. Do not skip the sugar or butter, or the crust will not stay together! I never realized that the sugar plays such an important role in the crust holding it’s shape, but you definitely don’t want to leave it out or your crust will fall apart! You’ll press the crumb mixture into the bottom of a lined 8×8 square pan.

Close up of the marshmallow pull, stretching the toasted marshmallow topping between two Bailey's S'mores brownies

How to make the brownie

Start by heating the Bailey’s (you can use milk instead if you prefer) and butter until the butter is melted and the Bailey’s is warm, but not boiling. Place cocoa powder and oil in a mixing bowl, and add the heated mixture to the mixing bowl and stir.  Cocoa powder only dissolves in hot liquid so it’s important that the mixture is heated before adding it to the cocoa powder.

You’ll then stir in the egg and egg yolk, and then the sugar. Add in the flour, salt, and espresso powder.  The espresso powder won’t give it a coffee flavor, but will enhance the chocolate flavor. Lastly you’ll stir in the chips.  I used a combination of Bailey’s chips and chocolate chips, but you can use all chocolate chips instead if you’d rather.  The Bailey’s chips are available at many grocery stores, but you can also order them online! You’ll pour the brownie batter on top of the graham cracker crust and bake.

Side view of a stack of three Bailey's s'mores brownies with some brownies around the stack

How to make the marshmallow topping

After removing the brownies from the oven, turn it up to broil, cover the top of the brownies with marshmallows, and then put back in the oven for 1-2 minutes.  Watch the marshmallows closely because they will burn quickly!

top down view of a bunch of Bailey's s'mores brownies on their sides to see the three layers of graham cracker crust, brownie center, and toasted marshmallow topping

Cool, cut, and enjoy!

Bailey's S'mores Brownies

Prep Time10 mins
Cook Time25 mins
Total Time35 mins
Servings: 25 Brownies



  • 2 cups graham cracker crumbs
  • 6 tablespoons butter melted
  • 1/3 cup sugar


  • 1/4 cup Bailey's can replace with milk if desired
  • 1/2 stick butter
  • 1/2 cup cocoa powder
  • 1/4 cup vegetable oil
  • 1 egg
  • 1 egg yolk
  • 1 1/2 cup sugar
  • 3/4 cup flour
  • 1 teaspoon kosher salt Diamond Crystal
  • 2 teaspoons espresso powder
  • 1/2 cup Bailey's chips can replace with chocolate chips if desired
  • 1/2 cup chocolate chips


  • mini marshmallows


  • Preheat oven to 350 F.
  • Line 8x8 pan with parchment paper.
  • Combine all crust ingredients until crumbs are fully moistened.
  • Press moistened crumbs into the bottom of the pan.
  • Heat Bailey's and butter over low heat until butter is melted and Bailey's is hot.
  • Put cocoa powder and oil in heat-proof mixing bowl.
  • Add heated mixture to mixing bowl and combine.
  • Mix in egg and yolk.
  • Stir in sugar.
  • Add in flour, salt, and espresso and mix until incorporated.
  • Stir in chips.
  • Pour batter over crust.
  • Bake for 25 minutes.
  • Turn oven up to broil.
  • Cover top of brownies with marshmallows.
  • Broil for 1-2 minutes till the marshmallows are just toasted. Watch closely, they will burn quickly!
  • Cool, cut, and enjoy!


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