Melt together the milk chocolate, golden syrup and butter (I do this in the microwave on a medium setting).
250 g milk chocolate, 3 tbsp golden syrup, 85 g butter
Add the crushed digestives and mix well. Leave to cool for a few minutes before adding the mini marshmallows.
200 g digestive biscuits, 75 g mini marshmallows
Add half of the share bag of chocolate M&Ms.
1 large bag chocolate M&Ms
Press the mixture into a tin lined with baking paper.
Melt the dark and white chocolate in separate bowls, pour over the mixture in the tin and marble the dark and white chocolate together with a knife.
200 g dark chocolate, 150 g white chocolate
Spread the remaining M&Ms on top. Chill in the fridge until set, at least for 2 hours but preferably overnight if you have time.
Cut into squares using a large knife. Serve or wrap and transport to your bake sale!