"To ensure the fruit retains its shape during baking, use plums that are almost -- but not quite -- ripe. They shouldn't be rock hard; rather, they should be soft yet slightly firm. You can use apricots, nectarines, or peaches in place of the plums...."
INGREDIENTS
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1 1/2 cups all-purpose flour
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2 teaspoons baking powder
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1/2 teaspoon salt
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3/4 cup plus 1 tablespoon sugar
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1/2 cup whole milk
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1/4 cup vegetable oil
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1 large egg
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9 or 10 large black plums, halved and pitted
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1/4 teaspoon ground cinnamon
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2 tablespoons cold unsalted butter, cut into small pieces, plus more for pans