Spray Slow Cooker with food release for easy clean up later
Dump Cherries into crockpot
Dump drained pineapple into crockpot (note my pictures show pineapple rings because that's what I had, however, I crushed them in food processor before using)
Add dry cake mix
Slice butter on top cover and cook on high for 3 hours or 4-5 hours on low