Preheat the oven to 200 C.Grease a 12-cup muffin tin or place a muffin paper in each slot (I like the muffin papers better ^_^)
Sift the flour, baking powder and salt into a large mixing bowl and stir in the sugar.
Place the eggs, milk, butter and vanilla into a separate bowl and whisk together well.
Fold the egg mixture into the dry ingredients with a metal spoon, then gently stir in the blueberries. (Don't stir the blueberries too much or you will get purple muffins!)
Spoon the mixture into the muffin cups, filling them to just below the top. Place the muffin tin on the top shelf of the oven and bake for 20-25 minutes, or until the muffins are well risen and lightly browned. Leave the muffins in the tin for about 10 minutes or they are going to fall apart! Turn the muffins onto a wire rack to cool (if you have one) and then serve = )