ingredients 3/4 cup PLUS 1 or 2 tablespoons sugar 8 tablespoons (1 stick) unsalted butter 1 cup all-purpose flour, sifted 1 teaspoon baking powder 2 eggs Pinch salt 24 halves pitted Italian (aka prune or purple) plums 1 teaspoon ground cinnamon, or more Vanilla ice cream, optional preparation 1. Arrange a rack in the lower…