I've missed the potato pies I used to occasionally buy from a SPAR store (not all stock them) on the way to work, but got a good tip from James Martin on TV this morning:

After frying mushrooms and other vegetables in a pan (he added chicken also), simply roll out a sheet of pastry over the top, crimp it to the pan edges, then place in the oven for about 25 minutes - if, as with mine, the frying pan is not all metal, from Steve (above), tinfoil may be used over the handle.

I shall give that a go shortly...

(As Donuel suggests, we have discussed pies here a couple of months or so ago.)