First grease a baking tin with butter, and line with baking parchment. Turn your oven to 180 degrees.
In a large mixing bowl, add the sugar, egg ,sunflower oil, vanilla and milk together, and beat until mixed.
Then add all of the dry ingredients and mix together until smooth. In a cereal bowl, melt one bar of plain chocolate in the microwave for 1 minute ( after 30 seconds take out and stir).
Add your Joe & Seph's Double Chocolate Popocorn, mini marshmallows and melted chocolate to your brownie mix and stir until completely coated.
Add to the prepared baking tin and pop into the oven for 30 minutes.
Take out and leave to cool for a minimum of 20 minutes.
When cool take your jar of Joe & Seph's Chocolate Caramel Chocolate Sauce, and smother over the brownies.
Melt your other bar of plain chocolate exactly as the same before but in a heatproof jug, when completely melted, add 200ml of double cream to the chocolate, stir immediately until you have a thick ganache.
Lather over the brownies ( like a chocolate spread, I would recommend using a spatula or a knife for this) .
Leave to set for a minimum of 2 hours and serve!