Preheat oven to 350°F.
Line a 12-cup muffin tin with paper liners. In a large bowl, whisk together milk, egg, and oil. Add flour, baking powder, salt, vanilla, sugar and blueberries; gently mix the batter with only a few strikes.
Spoon batter in lined muffin tin. Bake for 18 to 20 minutes or until toothpick comes out clean.