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Pe-heat oven to 200'C/400'F.
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Place caster sugar in a bowl and add all other dry ingredients which have been sifted together.
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Stir to mix well.
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In another bowl combine the egg, yoghurt, milk and vanilla.
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Pour into the midle of the dry ingredients and then add melted butter.
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Mix together gently.
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Place mixture into well greased muffin tins to come just over halfway up the tins.
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Place 1 teaspoon of Nutella into the middle of each (or place a square of chocolate in)and then cover with another spoonful of muffin mixture.
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Bake for approximately 15 minutes or until muffins are cooked and well risen.
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Remove from oven but leave in tins for 5 minutes before removing muffins from tin to cool on a rack.
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Sift over some icing sugar if desired -- this just gives a nice presentation.