Chocolate and Nutella Surprise Muffins

Ingredients

1 cup caster sugar
1 3/4 cups flour
1 teaspoon baking soda
1 teaspoon baking powder
1/4 cup cocoa
1 egg
1 cup plain yogurt
1/2 cup milk
1/2 teaspoon vanilla essence
100 g butter (melted)
12 teaspoons nutella

Instructions

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