I found this recipe in the July issue of NZ Gardener magazine. They are nice and zesty and the fresh citrus flavour makes a change from the norm.
3 tsp baking powder
1/4 cup caster sugar
1/4 cup milk (or a little more to make the correct consistency)
1 tsp grated lime rind
1/4 cup lime juice
250ml plain yoghurt
50 butter, melted
Glaze - juice and zest of 2 limes, 1/4 cup caster sugar. Heat gently until the sugar is dissolved. Spoon over hot muffins. You can also sprinkle on more sugar and decorate with lime rind (I just grated over a little more zest but omitted the extra sugar).
Sift the dry ingredients and mix together with a fork.
In a separate bowl mix the wet ingredients, then add to the dry. Mix gently to combine.
Bake in muffin pan for about 12-15mins at 200degC.