01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease thoroughly.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt until evenly distributed.
03 - In a separate bowl, whisk milk, vegetable oil, yogurt or sour cream, eggs, and vanilla extract until smooth and homogeneous.
04 - Pour wet mixture into dry ingredients and fold gently with a spatula until just combined, ensuring not to overmix.
05 - Toss blueberries with 1 tablespoon of flour to prevent sinking, then fold carefully into the batter.
06 - Distribute batter evenly among muffin cups. Optionally sprinkle tops with coarse sugar for a crunchy finish.
07 - Bake in the preheated oven for 18 to 22 minutes, or until a toothpick inserted in the center emerges clean.
08 - Allow muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely.