Which have you tried and tested?
Which do you like most?
Has anyone tried them topped with sliced swede, carrot, sweet potato, parsnips, turnip or butternut squash? I know these make good wedges so was thinking they could perhaps also work as a sliced topping either with olive oil or knobs of butter to make it crispy or with crispy cheese topping?
Other ideas I've come up with:
Chilli cottage pie topped with sliced sweet potatoes or sweet potato mash
Cottage pie/shepherds pie come moussaka (layer par boiled potato slices and mince and either pour cheese sauce over the top and top with grated cheese, browned under the grill or omit the sauce and just have the cheese topping.)
Cottage pie/shepherds pie with carrot, swede, parsnip, sweet potato, butternut squash and potato mash with sliced, cooked leeks stirred in and topped with grated cheese.
Cottage pie/shepherds pie with half mash and half sliced potato/sliced vegetables
And IMO cottage pie must always be made with onion gravy!