01 - Set oven to 375°F and prepare a 12-cup muffin tin with paper liners or lightly grease each cup.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt until evenly blended.
03 - In a separate bowl, whisk eggs, whole milk, vegetable oil, and vanilla extract until fully combined.
04 - Pour wet mixture into dry ingredients and stir gently until just combined; avoid overmixing to maintain tenderness.
05 - Carefully fold fresh or frozen blueberries into the batter to distribute evenly without breaking them.
06 - Divide batter evenly among muffin cups, filling each about three-quarters full. Sprinkle coarse sugar on top if desired.
07 - Bake for 18 to 22 minutes or until a toothpick inserted in the center comes out clean.
08 - Allow muffins to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.