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Line a 20 x 30cm tin with baking parchment
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Melt the chocolate, butter and golden syrup in a bowl set over a pan of simmering water
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Stir occasionally, until smooth and glossy
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Add the vanilla, biscuits, sultanas and Rice Krispies
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Mix well until everything is evenly coated
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Tip the mixture into the tin prepared tin and flatten with the back of a spoon
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Press in some mini eggs, if using, and put in the fridge or freezer until set
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When hard, drizzle over with the melted white chocolate and let set again
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Cut into squares and serve