Preheat the oven at 190°C.
In a large bowl, mix the flours, baking soda, baking powder, sugar and mix well with a fork or a whisk.
Whisk the oil / butter, vanilla extract, eggs and milk in another bowl. Add the lemon zest and lemon juice, give it a quick whisk and add this to the big bowl of dry ingredients.
Gently fold in the blueberries.
Line a 12 cup muffin tin with paper liners or grease them well with butter.
Divide the batter between the 12 muffin holes. If there's any extra, make in the next batch, or bake a baby cake with left over batter.
Bake for 15-20 minutes until the tops are golden brown.