Preheat oven to 375°F. Lightly grease a round 1-1/2 quart baking dish. In the baking dish, combine sugar and cornstarch; stir in blueberries. Separate rolls and arrange, cinnamon-sugar side down, over the berries. Bake until the rolls are golden and blueberries bubble, 25 to 30 minutes. If the rolls start to brown too quickly, cover loosely with aluminum foil. Drizzle with the prepared frosting that comes with the rolls. Serve warm. 

* Measure before defrosting.

Yield : 8 portions