Heat oven to 350. Dump pineapples and pie filling into a 9x11 pan. Pour the dry cake mix over the pineapple and cherry mixture. Melt the stick of butter and pour over the cake mix. Bake for 1 hour. Serve immediately or wait until later. Also really good with ice cream!
This is a great-simple dessert to bring to a pot luck or when you have company coming over. One thing that I do is at about the 30 minute/45 minute mark, I put shredded coconut on top.