Hot pot help please

[Yorky]

I've got plenty of chicken mushroom and bacon pasta sauce leftover from tea tonight so was going to cook off a couple more chicken pieces and put pastry over the lot, but wondered about a sliced potato topping instead- do I need to parboil them first? brush them with butter? what temp does th eovern need to be at? does the sauce need to be really runny to give moisture to potatoes?
Sorry if I'm making something simple sound really complicated!

Definitely cook them nearly through before adding as a topping. Then put foil over the whole thing and bake somewhere around 170C - 180C until everything thoroughly heated and potatoes finished in the steam. Reduces evaporation that way. Finally, remove foil, add a little butter to the top and bake uncovered until everything has coloured up.

Thank you Corgito, was delicious, will definitely be using it again when I can't be bothered with pastry