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Melt the peanut butter and white chocolate together in a heat proof bowl in the microwave - two 20 seconds blasts should do it, stirring well in between.
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Pour into the filling mould (share between six wells) and freeze for 12 hours before using.
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Preheat oven to 200˚C.
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When ready to bake, melt the dark chocolate and butter in the microwave as for the filling. Set aside.
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Whisk the egg and sugar with a hand beater until thick and pale.
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Whisk in the melted chocolate.
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Stir in the flour.
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Grease your molds with butter or spray with oil.
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Scrape all the fondant mixture into a small piping bag and pipe enough to fill 1cm deep.
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Place on a baking tray and bake for 5 minutes.
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Remove from oven, carefully drop a frozen peanut butter centre on top of the semi-baked batter and then pipe over the remaining mixture sharing evenly between the molds.
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Bake for an additional 10 minutes then remove and stand for 2 minutes (they are cooked when the top looks dry and have a light spring back when gently pressed).
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Place your serving plate or dish over each fondant and using oven mitts, invert and remove the mold - it should come away very easily indeed. Serve with cream or custard (or butterscotch sauce if you are going to be very bad!) and enjoy!