Pre-heat the oven to 150°C. Grease and line a loaf tin.
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Step 2
Melt the chocolate and butter together, either over a pan of simmering water or in the microwave on medium power, allow to cool slightly.
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Step 3
Beat the eggs and add in the sugar a little at a time, then add the chocolate mixture and mix until everything is well combined.
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Step 4
Sift in the flour and stir well, then stir in most of the chocolate chunks, marshmallows and chocolate coated rice balls.
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Step 5
Pour the mix into the prepared loaf tin and scatter the remaining chocolate chunks, marshmallows and rice balls over the top before baking.
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Step 6
Tap the tin to get rid of any excess air and bake in the centre of the oven for 25-35 minutes. It is important not to overcook the brownies as they can dry out a little if overbaked and are much nicer when they are a little gooey on the inside!
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Step 7
Leave to cool in the tin until completely cold, then turn out and cut into squares.