Go Back
5 from 1 vote
Thick and rich chocolate brownies on a cookie based topped with toasted marshmallows!
S'mores Brownies

Thick and rich fudgy chocolate brownies with a vanilla cookie base and toasted marshmallow top. 

Course: Dessert
Cuisine: American
Servings: 16 people
: 431 kcal
Author: Just Jo
For the cookie layer:
  • 125 g soft butter
  • 175 g caster sugar
  • 2 tsp vanilla extract
  • 1 large egg (whole)
  • 1 large egg yolk (save the white for the brownie layer)
  • 250 g plain flour
For the brownie layer:
  • 200 g soft butter
  • 175 g dark chocolate
  • 100 g caster sugar
  • 175 g soft brown sugar (muscovado if liked)
  • 3 large eggs (whole plus the white reserved from the cookie layer)
  • 1 tsp vanilla extract
  • 140 g plain flour
To finish:
  • 1/2 batch caramel latte marshmallows* (or about a 200g pack of bought marshmallows)
  1. Grease and line a 9 inch square tin with baking parchment. 

  2. Start by beating the butter and sugar until well combined then beat in the vanilla. Next, beat in the whole egg and the egg yolk (keep the white aside for now) and then fold in the flour. Dollop into your prepared cake tin and chill for thirty minutes. 

  3. When chilled, preheat the oven to 180˚C and set a shelf no higher than half way up in your oven - you don't want the brownie to burn. 

  4. Melt the butter and chocolate together in a saucepan over low to medium heat then whisk in the sugars. Take off the heat. 

  5. Beat in the 3 large eggs and the reserved egg white, followed by the vanilla. Fold in the flour. Pour on top of the chilled cookie dough layer then bake for 35-40 minutes until the brownie layer is dry on top but a skewer has one or two damp crumbs on it when inserted into the centre. It will rise very well. 

  6. Whilst still hot, cover the surface of the brownies with marshmallows and leave in the tin until absolutely stone cold. They will start to melt and form a nice even layer by the time it's cold. 

  7. When cold and the marshmallow layer is set, take it out of the tin, remove the baking parchment and using a blow torch, lightly toast your marshmallows. This should take seconds only. If you don't have a blowtorch, do this under a hot grill (broiler) - set the brownies now further away than 2 inches and stand and watch. The marshmallows will colour very quickly. 

  8. When cold, the marshmallow will be firm enough to slice. Slice up your brownies using a very sharp knife that you have carefully oiled, wiping as needed. They slice very well. Dig in! 

Recipe Notes

*= I can highly recommend my friend Mary's marshmallow recipe here - the coffee note is very good against the chocolate and sweetness of the mallow. Note that for UK readers, use golden syrup in place of the light corn syrup - it is oh so good here!