Grease bottom and sides of baking dish with stick of butter. Set butter aside.
Peel peaches, slice, and spread in baking dish.
Sprinkle cake mix all over peaches.
Melt butter and pour over peaches.
Bake for 45 minutes or until lightly browned on top.
Serve as is, or topped with ice cream or whipped cream.
Notes
To make this with canned peaches, you will need 2- 15 1/2 ounce cans of peaches. You can use peaches in syrup or in natural peach juice if you can find it.