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Cut the banana into round slices.
Melt the butter in a hot saucepan, add the bananas and sugar and stir for a few minutes.
Pre-heat the appliance. Spread 4 slices of brioche with some lightly salted butter. Cover the slices with grated chocolate.
Spread half of the banana slices onto half of the slices of brioche.
Assemble the toasties. Toast them in the appliance for 5 minutes.
Before serving, spread the remainder of the banana and chocolate over the toasties.