Paleo Mother-in-Law's Casserole

Sometimes I know what is for dinner that night and sometimes I am planning on my drive home.  Last night was a planning on the drive home.  Thinking of everything I had in the fridge reminded me for some reason of my first mother-in-law's casserole recipe - we are talking late 60's early 70's.  As far as I can remember it doesn't have a name and I don't know where she got the idea, but during that time it was my go to casserole when I had leftover roast beef.  I didn't have leftover roast beef in the fridge, but I did have leftover slow cooker roast pork.