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three s'mores brownies stacked on top of each other on a light pink surface

S'mores Brownies

The best dessert mash up, s'mores + brownies will be your new favorite! Starting with a graham cracker crust topped with brownie batter baked and topped with chocolate chunks and toasted marshmallows! Perfect for your next party dessert! 

  • Total Time: 45 minutes
  • Yield: 9-16 Brownies 1x


Units Scale

Graham Cracker Crust

  • 190 grams (6 3/4oz) Graham Cracker Crumbs, about 11 full-size graham crackers
  • 2 Tablespoons Granulated Sugar
  • 4oz (8 Tablespoons) Unsalted Butter

Brownies or use a Boxed Brownie Mix

  • 2oz (1/4 Cup) Water
  • 1oz (2 Tbsp) Unsalted Butter
  • 250 grams(1 1/4 cups) Granulated Sugar
  • 90 grams (Scant Cup) Bensdorp Dutch Cocoa Powder
  • 3oz (scant 1/3 cup) Vegetable Oil
  • 2 Teaspoons Pure Vanilla Extract
  • 1 Large Egg Yolk and 1 Large Egg, at room temp.
  • 1/8 Teaspoon Baking Soda
  • 1/2 Teaspoon Salt
  • 1 Tablespoon Cornstarch/ Cornflour
  • 60 grams (scant 1/2 cup) All-Purpose Flour/ Plain Flour
  • 4oz (1/2 heaping cup) Chocolate (chips, chunks, or bars chopped)


  • 3.5oz (1/2 Cup) Chocolate Chunks/ Chips
  • 5oz (1 Cup) Mini Marshmallows



Graham Cracker Crust

  1. Preheat your oven to 350F/180C and line a 9-inch square pan with foil and grease heavily.
  2. In a large bowl whisk the graham cracker crumbs and granulated sugar together. Pour in the melted butter and whisk to combine.
  3. Pour the crust into the prepared pan and use the bottom of a glass or measuring cup to pack the crust. Bake crust at 350F for 10 minutes. While crust is baking prepare brownies.


  1. In a large pot add the water, butter, sugar, and cocoa powder. Cook on medium heat for 2-3 minutes until it is all combined together, the mixture will look weird and not liquidy enough, which is fine. Then add the oil and vanilla extract. Cook on low an additional minute and mix to combine everything.
  2. Take off of the heat, let sit for 5 minutes then add the egg and egg yolk. Whisk to combine.
  3. Add the baking soda, salt, cornstarch, and mix to combine. Gently add the flour by using a spatula to fold in until just combined, just before there are no flour streaks add your chocolate chunks/ chips. Do not over mix, this will affect the end product.
  4. Pour into prepared pan and bake 25-27 minutes. 


  1. When brownies are just baked sprinkle on chocolate pieces and cover the whole pan in mini marshmallows turn the broiler on low and place the brownies under the heat. Watch carefully so they do not burn. Take out and let cool completely. To achieve clean cuts you must run your knife under hot water and clean the knife after each slice.
  • Author: Elizabeth Waterson I Confessions of a Baking Queen
  • Prep Time: 20
  • Cook Time: 25
  • Category: Dessert
  • Method: Baking
  • Cuisine: American

Keywords: s'mores brownies, s'mores dessert recipe, marshmallow brownies

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