Step 1

Preheat oven to 375 degrees F. Coat a 9-by-13-inch nonreactive baking dish (see Tip) with cooking spray.

Step 2

To prepare fruit: Combine peaches, brown sugar, 3 tablespoons all-purpose flour and a pinch of salt in a large bowl. Transfer to the prepared baking dish. Drizzle with bourbon (or vanilla). Tightly cover with foil. Bake until the fruit is steaming, 20 to 30 minutes.

Step 3

To prepare topping: Meanwhile, whisk whole-wheat flour, all-purpose flour, granulated sugar, baking powder, baking soda and salt in a large bowl. Add butter; rub with your fingers or use a pastry cutter until the pieces are smaller in size, but still visible.

Step 4

When the peaches are steaming, drizzle buttermilk over the flour mixture and stir with a fork until just combined. Dollop the cobbler topping on top of the hot fruit. Lightly brush the dough with buttermilk and sprinkle with coarse sugar.

Step 5

Bake until golden brown, 35 to 40 minutes more. Let cool at least 15 minutes before serving.