Step 1

Preheat oven to 350 degrees.

Step 2

Melt butter in a 10-inch cast-iron skillet, preferably enameled, over medium heat.

Step 3

Meanwhile, place peaches in a large bowl and sprinkle with 2 tablespoons granulated sugar.

Step 4

In another large bowl, whisk together flour, baking powder, and salt. Add remaining 1 cup granulated sugar, milk, and vanilla; whisk until well combined. Whisk in melted butter. Pour mixture into skillet and top with peaches. Sprinkle with sanding sugar.

Step 5

Bake until top is golden brown and a tester inserted in center comes out clean, 50 to 55 minutes. Serve warm or at room temperature with whipped cream, creme fraiche, or ice cream, if desired.