Preheat the oven to 425°F and line a muffin pan with 6 paper liners. Set aside.
In a medium-sized bowl whisk together 1 cup all-purpose flour, 1/2 cup granulated sugar, 1 3/4 tsp baking powder, and 1/4 tsp salt.
In a separate bowl whisk together 3 Tbsp milk, 1 Tbsp lemon juice, 3 Tbsp yogurt, 6 Tbsp oil, 1 egg, 1 tsp vanilla extract and 1 Tbsp lemon zest until combined.
Fold the dry ingredients into the wet ingredients with a rubber spatula and mix just until combined (be careful not to over mix your batter!).
Gently mix the flour-tossed blueberries into the batter until they're evenly distributed.
Divide the muffin batter evenly between the 6 muffin cups, filling them to the top of the liner.
If desired, press a few additional blueberries on top of each muffin and add a sprinkle of coarse sugar.
Bake the muffins for 6 minutes at 425°F / 218°C F to give the muffins a nice rise and a domed, golden-brown top, then (keeping the muffins in the oven) reduce the oven temperature to 350°F/175°C. Continue to bake for an additional 22-25 minutes.
Let the muffins sit in the pan for 10 minutes to cool, then move them to a wire rack to finish cooling.