Prep Time 20 minutes mins
Cook Time 30 minutes mins
Total Time 50 minutes mins
Slice potatoes paper-thin (⅛-inch) to ensure they cook through in the given time. Don't overwork the meat when mixing the patties. If the gravy seems too thin, simmer a bit longer; if too thick, whisk in a splash of broth. Resting the bake after the oven is key for the gravy to set. Leftovers keep 4 days in the fridge; the casserole can be frozen baked or unbaked for up to 3 months. Reheat covered at 325°F with a little broth.