Well, whatever it is, we made a "shepherd's" pie, but with chicken instead of lamb. (It was an original idea with me, but as soon as I Googled it, I discovered I was not the first to sub chicken for lamb.)
It was as easy as pie. Easier, because of the mashed potato topping replacing floury crust.
Take that, floury crust! Don't need you. (I like floury crust, but this is my story, and I'm sticking with it.)
Oh, yes, and no recipe. You just cook some vegetables al dente in a skillet with butter or oil. We used carrots, celery, onion and bits of broccoli. UPDATE: and mushrooms! Then make a gravy or sauce with some chicken stock and roux. A splish of milk. Cut up your leftover cooked chicken, and stir it, and the veggies, into the gravy. Salt and pepper. Herbs, if needed, but our chicken and stock were very herby. Pile this nice mix into a baking dish, top with mashed potatoes, bake for half an hour.
It's hard to tell you how happy this made me. I'm still happy, because we still have a couple more servings for supper tonight.
Yeah, let's call it Cooptender's Pie. I just Googled it; I'm first.