Put the sugar, flour, baking powder, baking soda and salt into a large bowl and mix together briefly with a spatula.
In another bowl, whisk together the wet ingredients: eggs, milk, sunflower oil and vanilla extract.
Add the contents of both bowls together and mix with a spatula until combined, this may be a bit lumpy. Do't over mix!
Take a muffin tin lined with cupcake liners. Use an ice-cream scoop to scoop the mixture into the muffin tins. If you're making muffins, you can fill the muffin tray as much as you like - I personally like to fill it to about half an inch below the rim.
Bake the muffins for 20 minutes at 200°C/400˚F (conventional oven) until cooked through and golden brown.
Tips
Did your muffins not come out of the oven creamy or fluffy enough? You may have over-mixed the batter or left the muffins in the oven too long or too hot.
How to store
Store muffins in an airtight container outside the fridge.