Stone Fruit

Nectarine and Plum Upside-down Cake

Makes 9 servings Hands-on time: about 15 minutes Total preparation time: about 55 minutes 8 tablespoons (1 stick) unsalted butter, softened 3 tablespoons light brown sugar 1 tablespoon plus 1 teaspoon vanilla extract 2 medium nectarines, each cut into 8 slices 2 large plums, each cut into 8 slices 2/3…