How to Make It
Preheat oven to 375°F. Lightly coat a 13- x 9-inch baking dish with cooking spray. Drain 1 can of peaches.
Pour drained peaches and 2 cans of undrained peaches in bottom of baking dish. Evenly sprinkle cake mix over peaches. Cut butter into at least 16 slices, and distribute them evenly over cake mix.
Bake until golden and bubbly around, about 35 minutes. Let stand 10 minutes before serving.