Preheat oven to 220°C/200°C fan. Line your muffin tray with muffin cases or spray with non-stick spray.
In a large bowl whisk together the plain flour, baking powder, bicarbonate of soda, salt, caster sugar, light brown sugar and poppy seeds until combined. Set aside.
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In a medium bowl whisk the melted butter, eggs, buttermilk, sunflower oil, lemon juice and lemon zest until combined.
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Pour the wet mixture into the bowl of dry ingredients, and fold together with a wooden spoon or rubber spatula until just combined. Just mix until no pockets of flour remain; over mixing at this stage will result in dry, heavy muffins!
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Spoon the mixture into the muffin cases/holes and fill each about 3/4 full.
Place the muffin tray into your preheated oven on the middle shelf. Set a timer for 5 minutes. This initial 5 minutes at high temperature causes the muffins to rise more rapidly.
At the 5 minute point, turn the oven temperature down to 180°C/160°C fan, keeping the oven door closed. Bake the muffins for a further 13-15 minutes.
Remove the muffin tray from the oven and place onto a wire rack to cool for 5 minutes, then remove the muffins and place them on the wire rack to cool completely.