Preheat oven 350° F. Unroll pie crust over a 9 inch pie pan, per "Using Crust" package instructions. Mix together the sweet potatoes, 1/2 of the cream, 1/2 of sugar, butter, vanilla, cinnamon, nutmeg, and salt, until smooth. Taste and adjust seasoning (add more cream if desired or if mixture is too dry). In a separate small bowl, whip eggs with a whisk, and then fold into the sweet potato mixture. Pour mixture into the pie crust. Place pie in oven and bake for 1 hour or until the center is firm and dry (use a tooth pick to test). It may be a little brown around the edges. Remove from oven and allow pie to cool on a rack before cutting and serving. Serve with a dollop of whipping cream (see package directions).