In a separate bowl, sift flour, baking powder, sugar and salt.
Stir in buttermilk just until incorporated.
In a 12" cast iron pan (or a size close to this), melt 1/2 cup of butter in your preheated oven.
Carefully remove the cast iron pan from the oven and pour the cobbler filling overtop of the butter.
Spoon the peaches with the sauce on top of the cobbler filling trying to get even coverage. Pour any left over sauce from the peaches onto the cobbler filling as well.
Bake for approximately 30 minutes, turning half way. *Note, in my oven, this was baked after 27 minutes. Start checking at the 25 minute point.
Allow to rest on the stove top for approx. 10 minutes. Serve warm with whipped cream or ice cream if you would like. This is also delicious served room temperature.