
Preheat oven to 350°F (180°C), grease and flour a 6 donut pan.
In a medium bowl whisk together flour, baking powder, baking soda, salt and sugar.
In a medium bowl whisk together egg, milk, yogurt, vanilla and melted butter until smooth.
Mix wet ingredients into dry ingredients, just until smooth, gently fold in blueberries. Fill donut pan and bake 10 minutes. Remove from pan, let cool completely then drizzle with lemon glaze if desired. Enjoy!
In a small bowl mix together until smooth powder sugar and lemon juice (add a tablespoon at a time to reach desired constituency).