I made this with some quick minute mash potatoes and it wasn't very good. I'm a little autistic and the taste was meh, I tried to force myself to eat it, got three bites, and said "welp that's a meal" I am going to try and save this dish tonight with some beans and veggies, I will update.
Update: I fixed it. I mixed the gravy into the potatoes with some more butter, salt, pepper, onion powder, garlic powder, a bag of frozen mixed veggies and a patty of vegan burger. I'm still not making this again. My mixed shepardish pie was better without it.