Making muffins is unlike any other kind of baking I've really done. The butter (75g) is melted, left to cool a little, and then mixed with yoghurt, milk (100 ml of each) and an egg. In a separate bowl, you mix 200g plain flour, 2 tsp baking powder, 1/2 tsp bicarbonate of soda, a tsp of salt and 75g caster sugar. Then you mix the two mixtures - wet and dry - together, before stirring through 200g blueberries.
I know they'll never be as dome-topped as the ones you get at Starbucks, but they're delicious.
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I have to confess this picture isn't mine - my camera battery has died today - so it's from womentribe.com.