Preheat oven to 375 F. In a small measuring cup, whisk together milk and vinegar. Let sit for 5 minutes.
In a large bowl, whisk together flour, sugar, baking powder, and salt. Add in melted butter, milk mixture and eggs. Whisk until just combined, fold in fresh blueberries.
Divide batter evenly between a greased 12-cup muffin pan. Bake for 20-25 minutes.