Preheat oven to 180ºC fan bake. Line a 12-hole muffin tin with paper cases.
Sift flour, cocoa powder, baking soda and salt into a large bowl. Stir in sugars and chocolate chips.
In a separate bowl, whisk together egg, yoghurt, milk, oil and vanilla essence. Add to dry ingredients and mix until just combined (don't over-mix).
Divide mixture evenly between muffin tin holes. Sprinkle with extra chocolate chips, if desired. Bake for 18-20 minutes, until muffins spring back when lightly pressed.
Leave to cool in tins for a couple of minutes before transferring to a wire cooling rack.
Tips
Muffins are best eaten fresh on the day they're made. Store any leftovers in an airtight container and reheat in the microwave to warm through.
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