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Preheat the oven to 165°C – 330°F and line muffin trays with papers.
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Combine the flour, cocoa, baking powder and salt together in a bowl and set aside.
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Then cream the butter, vanilla and brown sugar until pale and fluffy.
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Add the eggs, one at a time, beating until well incorporated. Remember to scrape down the sides of the bowl as needed.
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Add the flour and cocoa powder mixture in three batches, alternating it with two additions of buttermilk (or yogurt) and milk. Beat until well combined.
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Put the batter into the lined muffin tray cups, filling each to about half.
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Bake for about 25 minutes or until cooked through.
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When cooked, let them cool down in the tray for 10 minutes, then put them on a wire rack to cool down completely.