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Preheat your oven to 175ºC/350ºF .
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Grease an 8 x 4 loaf tin with butter and then sprinkle sugar inside.
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Beat the butter and sugar until light and fluffy.
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Beat in the egg and vanilla essence.
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Combine the flour, baking powder and salt in a separate bowl.
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Add the flour mix alternatively with the buttermilk in small amounts at a time, starting with flour and ending with the buttermilk.
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Fold in the frozen blueberries (do not defrost them)
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Bake for 50 -60 minutes or until a skewer comes out clean when inserted into the centre.
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(If you are making this in muffin cases, spray the cases with cooking spray and cook for 30-40 minutes)
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Cool on a wire rack.