In a large bowl, combine your peaches, bourbon, brown sugar, sugar, corn starch, and cinnamon.
In a cast iron skillet, heat your 4 tablespoon of butter on a medium heat. Add your peach mixture and cook on medium heat for about 5 minutes. Put aside, keeping your mixture in the skillet.
Topping
In a large bowl mix together your flour, baking powder, sugar, and salt.
Using a pastry cutter, cut in your cold butter until the mixture resembles the size of oats.
Add the heavy cream to your mixture. Mix until combined.
Divide the dough into about 6 large balls. Place these balls of dough on top of your peaches.
Using any remaining cream, brush some on top of your dough and then sprinkle with a little extra sugar and cinnamon.
Place skillet in the oven at 375 degrees for 45 minutes.