Melt 2 tablespoons butter and pour into pan; swirl to coat paper. Sprinkle 1/2 cup brown sugar evenly over butter. Arrange plum evenly in pan, then add blueberries, filling in any gaps.

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Add sugar and whisk until well blended. Pour syrup into a 9-inch cake pan with 2-inch high sides, tilting pan to cover bottom evenly. Lightly press plum wedges into syrup, arranging them like ...