Melt butter in bottom of 9x13 pan.  Open can of fruit or pie filling and pour into pan.  Do not drain fruit.  Open cake mix and pour on top of fruit.  You may have to break up the dry mix and spread around to cover top.  Press down slightly to make sure cake mix is moist.  Bake at 350 for 45 min to 1 hr.  Serve warm and is also good with vanilla ice cream!