Plum Skillet Cake

From Martha Stewart

4 tbs unsalted butter, room temperature, plus more for skillet
1 cup all-purpose flour, plus more for skillet
½ teaspoon baking powder
¼ teaspoon baking soda
Coarse salt
¾ cup plus 2 tbs sugar
1 large egg
½ cup low-fat buttermilk
2 ripe medium plums, thinly sliced

Preheat oven to 375°. Butter an 8-inch ovenproof skillet (preferably cast-iron); dust with flour, tapping out excess. Whisk together flour, baking powder, baking soda, and ½ teaspoon salt. Beat butter and ¾ cup sugar with a mixer on medium speed until pale and fluffy. Beat in egg. Add flour mixture in 3 additions, alternating with buttermilk.

Pour batter into prepared skillet, and smooth top with an offset spatula. Fan plums on top, and sprinkle with remaining 2 tablespoons sugar. Bake until golden brown and a toothpick inserted into the center comes out clean, 35 to 40 minutes. Let cool slightly.

Some important tips to share: Wait until the cake is halfway done baking before adding the plums.  The top row is the first cake I made, and you can see that the beautiful plums sank into the batter as the cake baked.  Also, the plums were only in the center of the cake, so the outer edges didn't have any of the delicious fruit.  In the bottom row, I added the plums after 15 minutes of baking, and you can see that they barely sank in.  I also increased the number of plums to four, so every slice of cake has plenty of fruit.