Preheat6 the oven to 375°. In a medium size bowl, combine the blueberries with 2 tbsp of the granulated sugar and let stand while preparing the batter.
In a food processor or blender, whirl the remaining granulated sugar, milk, flour, eggs, orange rind, vanilla and cinnamon for 30 seconds or until smooth. Or put all the ingredients in a medium-size bowl and stir until just blended.
Lightly grease a 9-in pie plate and arrange the blueberries on the bottom. Spread the batter evenly over the blueberries and bake for 35-40 or until puffed and lightly golden. Sprinkle with confectioners sugar.