1 1/2
cups all - purpose flour 2 tablespoons cornstarch 1/4 teaspoon ground cinnamon 1/2 teaspoon baking powder 1/4 teaspoon baking soda 1/2 teaspoon Kosher or sea salt 1/2
cup (1 stick) unsalted butter, softened to room temperature 1/2
cup dark brown sugar 1/2
cup granulated sugar 2 large eggs, room temperature 2 teaspoons pure vanilla extract 1/4 teaspoon almond extract 1
cup buttermilk, room temperature 4 - 6 plums, * halved and pitted (I used empress plums) 1/4
-1 / 3
cup confectioner's sugar, for topping