Grease a medium or large slow cooker with non-stick cooking spray. Add peaches and sprinkle with the granulated sugar.
In a separate bowl combine the flour, brown sugar, baking powder, baking soda, salt and cinnamon.
Add the cubed butter and cut into the dry ingredients with a pastry blender or fork until the butter is the size of small peas. Add the buttermilk and mix until it forms a sticky dough. Spoon over the peaches.
Cook in the slow cooker on low heat for 3 to 3 ½ hours, or until the surface of the cobbler appears dry and the fruit juices are bubbling. Serve with whipped cream or ice cream if desired.
Note: To catch condensation in the slow cooker during cooking, and to prevent the cobbler from getting soggy, place a large paper towel over the slow cooker and then put the lid on top of the paper towel.
Calories: 247kcal, Carbohydrates: 41g, Protein: 4g, Fat: 9g, Saturated Fat: 5g, Cholesterol: 22mg, Sodium: 304mg, Potassium: 335mg, Fiber: 2g, Sugar: 23g, Vitamin A: 628IU, Vitamin C: 7mg, Calcium: 64mg, Iron: 1mg