Preheat oven to 425°F and line your muffin tin.
Coat blueberries with a spoonful of flour to keep them from sinking.
Mix dry ingredients: In one bowl, whisk flour, baking soda, baking powder, and salt.
Mix wet: In a bigger bowl, combine discard, milk, egg, melted butter, sugar, yogurt, and vanilla.
Combine wet and dry ingredients gently, careful to not overmix.
Fold in the blueberries carefully.
Rest the batter in the fridge for an hour, or overnight if making ahead.
Scoop into muffin cups, about 3/4 full. Sprinkle turbinado sugar on top.
Bake at 425°F for 10 minutes, then reduce to 350°F and bake another 12-16 minutes.
Cool in the pan for 5 minutes then transfer to a wire rack.