This is not my recipe, but it it very, very easy, it’s good for what ails you, it doesn’t have a long ingredient list, and it’s what I’m making for dinner tonight.
I’ve found other recipes but the one I’ve linked to is the first one I found so I’ll share that one. Lots of room for experimentation and using what you have. It’s also in The Scots Kitchen by F. Marian MacNeill, with a few variations.