INGREDIENTS
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1 cup all-purpose flour, plus 1/3 cup for the topping
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1/2 cup granulated sugar, plus 1/4 cup for the topping
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2 tablespoons brown sugar, packed
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1/2 teaspoon ground cinnamon
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1/2 cup unsalted butter, cold and divided
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1 teaspoon baking powder
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1 teaspoon ground ginger
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1/4 teaspoon salt
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1 large egg
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1 teaspoon vanilla
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1/3 cup milk
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1 1/2 cup frozen blackberries