Foryoueats: Late Summer Plum Cake

Ingredients

• 1½ cups all-purpose flour, spooned into measuring cup and leveled-off
• 1½ teaspoons baking powder
• 1 teaspoon cinnamon
• ¼ teaspoon nutmeg
• ⅛ teaspoon cardamom
• ½ teaspoon salt
• 8 tablespoons (½ cup) unsalted butter, softened, plus more for greasing the pan
• 1 cup plus 2 tablespoons sugar, divided
• 1 large egg
• 1 teaspoon vanilla extract
• ½ cup milk (low-fat is fine)
• 1 pound plums, pitted and quartered