Toss the blueberries with cinnamon and lemon juice. Place in a greased 8 in. sq. baking dish. In a bowl, combine flour, sugar and baking powder. Stir in milk and butter. Spoon over berries. Combine sugar and cornstarch; sprinkle over batter. Slowly pour boiling water over all.
Bake at 350 for 45-50 mins. or until the cake tests done.
Yield: 9 servings.
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