Preheat the oven to 200C and prepare a baking tray
Heat a grill pan on high heat and spread the butter over each slice
Grill the bread butter side down until golden
Transfer the slices of bread onto the baking tray grilled side down
Combine the sugar, cinnamon and coconut biscuits and sprinkle over each slice
Break the chocolate into pieces and divide between two slices, randomly placing the pieces of chocolate Divide the mmmMallows between the remaining two slice.
Bake in the oven for 5-10 minutes, or until mmmMallows are gently charred and chocolate melted
Sandwich together a chocolate slice and mmmMallow slice, cut, and serve
Chefs Tip: This recipe can also be made using a sandwich press or waffle iron.