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1. Preheat oven to 425 degrees and grease a small casserole dish. (Not a 9X13, something smaller, like a 2 qt. pan)
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2. Combine blueberries, sugars, lemon juice, lemon zest and cornstarch.
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3. Pour into pan and bake for 10 minutes.
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4. While baking the blueberries, in a large bowl combine flour, sugars, baking soda, salt and cinnamon. Add butter and use a pastry cutter to combine until mixture resembles coarse meal. Add water and stir until combined.
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5. Cover blueberries with topping and sprinkle cinnamon-sugar over the top if desired.
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6. Bake for about 30 minutes or until topping is done.
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7. Serve warm with vanilla ice cream.