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In a microwave-safe bowl, melt 200 g – 7 oz of dark chocolate.
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Line a 20 cm – 8 x 8 in square baking dish with baking paper, and spread the melted dark chocolate over the surface. Refrigerate until hard.
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In another microwave-safe bowl, melt 135 g – 4 ¾ oz of white chocolate, and spread it over the first layer of dark chocolate. Refrigerate again until hardened.
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Melt the remaining dark chocolate and white chocolate in two separate bowls.
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Spoon a little of the melted dark chocolate into a piping bag, and spread the rest over the hardened bark.
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Spoon all of the white chocolate into a piping bag. While the final layer of chocolate is still warm, pipe circles of white chocolate to form ghosts. Using a toothpick or metal skewer, drag one end of each circle out to create a tail.
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Using the dark chocolate in the piping bag, pipe eyes and mouths onto the ghosts.
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Add some chocolate pearls and refrigerate to harden completely.
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Cut into squares and serve.