INGREDIENTS
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1/2 cup plus 1 tablespoon all-purpose flour (spooned and leveled)
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1 cup plus 2 tablespoons packed light-brown sugar
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1/2 cup old-fashioned rolled oats (not quick-cooking)
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1/4 teaspoon salt
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1/2 cup (1 stick) cold unsalted butter, cut into small pieces
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2 1/2 pounds ripe plums (about 8), cut into 1-inch pieces