You need a 9 x 13 pan.
Dump 1 can of crushed pineapple, one can of cherry pie filling into pan. Dump one box of yellow cake mix on top. I like nuts so I dump a bag of walnuts on top of that. Cut 2 sticks of real butter into slices and dot the top of your dump pile. Bake at 350 for 1 hour.
This is like a cobbler. I use a spoon to scoop a bunch out and put on a plate. This is great with ice cream on top!