Plum Cornmeal Cake

Ingredients (12)

• 1 1/2 cups all-purpose Gold Medal flour
• 1 teaspoon baking powder
• 1/4 teaspoon ground cinnamon
• 1/8 teaspoon salt
• 1/2 cup plus 1 tablespoon coarse cornmeal
• 12 tablespoons unsalted butter
• 1 cup granulated sugar
• 3 large eggs
• 1 teaspoon vanilla extract
• 1/3 cup buttermilk
• 4-6 ripe plums
• Turbinado sugar