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Preheat oven to 375 degrees F. Lightly grease a 9x9 inch baking pan, set aside.
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In a large bowl combine the flour, sugar, baking powder and salt. Cut in the butter with a pastry blender or two knives until coarse crumbs. Stir in the egg and milk until combined. Pat into prepared pan.
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In a large bowl combine the blueberries, sugar, lemon juice, zest, flour and cinnamon, stirring gently. Spoon over the crust.
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For the streusel topping, combine the flour, brown sugar and cinnamon in a small bowl. Cut in the butter with a pastry blender or two knives until coarse crumbs. Sprinkle over the top of the blueberry mixture.
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Bake for 45 minutes or until the top is golden. Cool completely before cutting into bars.