Apple Muffin recipe is on the link below.
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More information on her show Healthy Appetite, with recipes, etc.
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re Buttermilk...This used to be a by-product of butter making, hence its name, but now we have specially cultured buttermilk which is made by adding a culture to skimmed milk. It has the same acidic flavour as the original and is perfect for making extra-light scones, soda bread and American style pancakes.
You should be able to get buttermilk from the dairy section of the larger supermarkets. If not, just use ordinary milk.
You could make your own....
175ml ordinary milk
10ml vinegar or lemon juice
Add the vinegar or lemon juice to the milk, let stand a few minutes to sour.