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Preheat oven to 375 degrees.
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Spray a 9”x 6” baking dish with non-stick baking spray.
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In a large bowl add the berries.
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Drizzle the berries with lemon juice.
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Toss to combine.
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Add the cornstarch to the berries and toss to combine.
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Allow the berries to marinate for 20 minutes.
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In a separate large bowl whisk together the flour, baking powder, and salt.
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Set to the side.
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In the bowl of a stand mixer, beat the butter, brown sugar, and vanilla until well-blended.
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Slowly add in the dry ingredients until the mixture resembles little crumbs.
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Pour the berries into the baking dish.
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Drop the dough evenly on top of the berries.
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Bake for 30 minutes, or until the top is lightly browned.
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Enjoy