Chocolate brownie with hot chocolate ganache and marshmallows

Hot Chocolate Ganache Brownie: Wheat Flour (Wheat Flour, Calcium Carbonate, Iron, Niacin, Thiamin), Luxury Belgian Milk Chocolate 22% (Sugar, Cocoa Butter, Whole MILK Powder, Cocoa Mass, Soya Lecithin E322, Natural Vanilla), Vegetable Fat Spread [Vegetable Oils (Rapeseed, Palm, Sunflower), Water, Salt, Buttermilk, Preservative (Potassium Sorbate), Emulsifier (Mono and Diglycerides of Fatty Acids), Acid (Citric Acid), Flavourings, Vitamin A and D, Colour (Carotene)], White Chocolate 12% (Sugar, Cocoa Butter, Whole MILK Powder, Whey Powder, LACTOSE, Butter Oil, SOYA Lecithin E322, Natural Vanilla), Sugar, Eggs, Cocoa Powder 6%, Double Cream (Milk), Hot Chocolate Powder 2% (Whey Permeate (Milk), Sugar, Fat Reduced Cocoa Powder, Coconut Oil, Glucose Syrup, Lactose (Milk), Milk Chocolate (Sugar, Cocoa Butter, Skimmed Milk Powder, Cocoa Mass, Lactose and Protein from Whey (Milk), Palm Fat, Whey Powder (Milk), Milk Fat, Emulsifier (Soya Lecithin), Vanilla Extract), Skimmed Milk Powder, Flavourings, Stabilisers (E412, E466, E340ii, E339ii, E452i), Anti-Caking Agent (E551), Sea Salt, Potassium Chloride, Milk Proteins, Magnesium Sulphate, Emulsifier (E471), Sweetener (E955)), Vegan Marshmallows 1% (Fructose Syrup, Sugar, Dextrose, Carrageenan, Maize Starch, Hydrolized Rice Protein, Flavour (Vanilla), Polyphosphate, Colours: Red Beetroot and Titanium Dioxide)