Preheat oven to 180°C.
Line your muffin tray with 10 muffin cases.
In a large mixing bowl, place the melted butter, Natvia, eggs, apple, buttermilk and vanilla.
Whisk until well combined.
In a separate bowl, sift together the flour, baking powder and spices, drinking chocolate (or cocoa) and mix thoroughly.
Pour the liquid mixture into the dry mixture.
Add the chocolate bits and mix very lightly until just combined, using a metal spoon.
Do not over mix!
Quickly divide muffin mix between muffin cases, filling each one about ¾ full. Bake on the centre shelf of the oven for 20 – 25 minutes, or until when touched they spring back.
Stand for 5 minutes before turning out onto a cooling rack.
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