Line an 8x8x3-inch tin with baking paper, leaving a little hanging over the edges for easy removal later.
Melt the milk chocolate, butter, golden syrup and cocoa powder together in a saucepan. Remove it from the heat and leave to cool for a couple of minutes.
Add the digestive biscuits and pretzels to a large bowl then crush them into medium-sized pieces using your hands or a rolling pin. Then stir in the marshmallows and the popcorn.
Pour the melted chocolate into the bowl and mix until everything is evenly covered. Transfer the mixture to your tin and press it down firmly.
Refrigerate for 3 hours then cut into squares and enjoy!
Video
Notes
Store in an airtight container in the fridge for up to 2 weeks.