INGREDIENTS
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Unsalted butter, for greasing insert
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1/4 cup cornstarch
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2 tablespoons lemon juice (about 1 lemon)
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Two 12-ounce bags frozen mixed berries (about 5 1/2 cups)
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2/3 cup granulated sugar
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1 1/4 cups all-purpose flour
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3 tablespoons granulated sugar
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1 teaspoon baking powder
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Pinch fine salt
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4 tablespoons cold unsalted butter, cut into small pieces
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3/4 cup milk
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1/4 teaspoon ground cinnamon
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1/2 cup heavy cream
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1/4 cup sour cream
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2 tablespoons confectioners' sugar