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Preheat oven to 375 F.
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Grease a 9x13 pan.
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In medium bowl, stir together 1 cup sugar, flour, and baking powder.
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Mix in salt and cinnamon, if desired.
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Use a fork/pastry cutter/hands and cut in the butter until it resembles the size of peas.
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Add egg and combine until it just comes together. Dough will be crumbly.
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Pat half of dough into prepared pan.
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In another bowl, stir together sugar and cornstarch.
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Gently mix in the blueberries.
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Spread the blueberry mixture evenly over the bottom pressed dough.
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Sprinkle remaining topping over the berry layer.
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Bake for 45 minutes, or until top is slightly brown.
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Cool completely before cutting into squares.