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
24 halves pitted Italian (aka prune or purple) plums
1 teaspoon ground cinnamon, or more
Vanilla ice cream, optional
1. Arrange a rack in the lower third of the oven. Preheat the oven to 350°F.
2. In an electric mixer, cream the 3/4 cup sugar and butter. Add the flour, baking powder, eggs, and salt and beat to mix well. Place in a 9-inch greased springform pan. Cover the top with the plums, skin side down. Mix the cinnamon with the remaining 1 or 2 tablespoons of sugar and sprinkle over the top.
3. Bake for 40 to 50 minutes, until the center tests done with a toothpick. Remove and cool to room temperature or serve warm.
Serve with vanilla ice cream.