Preheat oven to 375 degrees F. Drain 2 of the 3 cans of peaches (leaving just 1 can undrained). Empty peaches evenly into bottom of a 9×13 dish. Sprinkle peaches evenly with cinnamon.– Cover the peaches with the dry cake mix and use the back of a fork to gently press the cake mix down evenly.–
– Sprinkle brown sugar evenly over cake mix. Top with butter slices. Sprinkle on chopped pecans. Bake at 375 degrees F. for one hour, until golden brown. If pecans begin to get too dark, loosely cover baking dish with aluminum foil and finish baking.