Preheat the oven to 375F.
Roll the pie dough out and fit it in a 9" pie pan. Trim any overhang. Create a pretty border by pinching the edge between your thumb and finger all the way around if you'd like.
Peel, core and thinly slice the apples, adding to the pie dough until the apples are nicely mounded. (They'll shrink down as they cook.)
In a small bowl, combine the sugar, flour and salt and mix well, then stir in the cream. Pour this over the apples.
Sprinkle the apples with ground cinnamon.
Cover the pie loosely with foil and bake for 1 hour.
Take the foil off and bake another 15 minutes, until the apples are done. (Test this with a paring knife. It should go in easily.)