Preparation Notes: Hands on time 15min, plus cooling
Advertisement - Continue Reading Below
- 150 g (5oz) butter
- 200 g (7oz) good quality dark chocolate (at least 70% cocoa), broken into small pieces
- 250 g (9oz) caster sugar
- 3 medium eggs
- 1 1/2 tsp vanilla extract
- 75 g (3oz) plain flour
- 40 g (1 1/2oz) cocoa powder
- 50 g (2oz) mini marshmallows
- 50 g (2oz) Digestive biscuits, broken into pieces
- Step 1
Preheat the oven to 180°C (160°C fan) mark 4. Grease and line a 20.5cm (8in) square tin with baking parchment.
- Step 2
Put the butter and 150g (5oz) chocolate in a heat-proof bowl set over a pan of barely simmering water and stir frequently, until melted and smooth (alternatively, microwave in 30sec bursts). Take off the heat.
- Step 3
In turn, beat in the sugar, then the eggs and then the vanilla with a wooden spoon. Sift over the flour and cocoa powder and stir to make a smooth batter.
- Step 4
Pour the mixture into the prepared tin and spread to the edges. Bake for 20-25min or until there is no wobble left when you gently shake the tin.
- Step 5
Preheat the grill to high. Sprinkle the marshmallows over the brownie. Poke the broken biscuits into the top and dot over the remaining chocolate pieces. Grill for 30sec-1min, or until the marshmallow is lightly golden (don’t over cook in order to melt the marshmallows, as they will burn – if they aren’t melting down, remove from grill and gently squish them with the back of a spoon and grill for another 30sec. They will continue to melt and form a layer in the residual heat as the brownie cools).
- Step 6
Allow to cool completely in the tin before slicing (see GH Tip) or alternatively, cool for 15min and serve warm.
GH Tip
To get neater slices from your brownies, chill the brownies for at least 3hr or overnight to firm up. Allow to come up to room temperature before removing from the tin, then wet a knife under a running tap to stop the marshmallow from sticking to the blade, shake off the excess water and cut brownie into squares, wiping and wetting the knife for each cut.
Per Serving:
- Calories: 261
- Fibre: 1 g
- Total carbs: 32 g
- Sugars: 26 g
- Total fat: 13 g
- Saturated fat: 8 g
- Protein: 3 g

The GH Kitchen Team are Good Housekeeping’s resident recipe developers and all-round food obsessives. GH Kitchen Director Sarah Akhurst is our resident hosting pro and loves nothing more than putting on a foodie feast for friends. Our GH Kitchen Manager Linzi Pucino is our very own Italian food expert (originally hailing from the North East of Scotland!) and can be found working her way through midweek recipes that cover all bases, from haggis to ragu! Our Kitchen Editor Nadine Brown loves digging into the stories behind her favourite foods and enjoys applying her eclectic tastes to more modern, flavour-forward recipes - just don't give her too much chilli! Our Junior Food Content Produce Frankie Prichard combines a love of beautiful presentation and flavour-led, seasonal cooking in her recipe development, along with a passion for bringing people together through food. With a wealth of professional kitchen experience between them, they’re dedicated to ensuring every Good Housekeeping recipe is the best it can be, so you can trust they’ll work every single time
Advertisement - Continue Reading Below
Advertisement - Continue Reading Below
Advertisement - Continue Reading Below