1/3 cup plus 1 tablespoon sugar 1/4 teaspoon cinnamon 3 sheets phyllo dough, trimmed to 12-by-16 inches Cooking spray 1 tablespoon cornstarch Pinch table salt 1/3 cup water 2 cups fresh blueberries, divided 1 tablespoon fresh lemon juice 1/2 teaspoon grated lemon zest Low-fat vanilla yogurt, to garnish, if desired Heat the oven to 400 degrees.In a small bowl, combine 1 tablespoon of the sugar with the cinnamon. Lay 1 phyllo sheet flat on a baking sheet, keeping the remaining phyllo sheets covered with plastic wrap and a damp kitchen towel. Spray the phyllo sheet lightly with the cooking spray, then sprinkle it with 1 teaspoon of the cinnamon-sugar mixture.