1 (18.25 ounce) box yellow cake mix
1 (32 ounce) can peaches in heavy syrup
1/2 cup butter
Preheat oven to 375 degrees F.
Empty peaches into the bottom of a 13 x 9- inch pan. Cover with the dry cake mix and press down firmly. Cut butter or margarine into small pieces and place on top of cake mix. Sprinkle top with cinnamon.
Bake for 45 minutes.