Set oven to 180°C convention or 160°C fan forced / convection.
Grease and line a 20 cm loaf tin with melted butter (see Note 3).
In a large bowl, add yoghurt, sugar, eggs, butter, lemon zest, salt and mix with a whisk until combined.
Add flour and whisk till batter is smooth then fold blueberries into the batter with a large spoon or silicone spatula.
Pour and scrape batter into the prepared loaf tin, bake for 60 minutes or until a skewer inserted in the middle comes out clean. Cool in the tin for about 10 minutes before turning it out onto a wire rack to cool completely (or cool enough for you to dig in without burning yourself!).