Preheat oven to 325F (170C).
Combine flour, baking powder and sugar in a large bowl and stir to mix.
In a jug, combine sunflower oil, water and vanilla extract.
Make a well in the center of the flour mixture and pour in wet ingredients.
Add the blue food dye to the mixture.
Using a whisk, mix until the wet and dry ingredients are well combined and the blue dye is distributed evenly.
Pour or scoop 2 ¼oz (65g) of batter into each muffin case (the batter should make roughly 12 muffins).
Bake for 24-26 mins, or until a skewer comes out clean when inserted into the center of the muffin.
Set aside to cool for 20 - 30 minutes.