Sweet Potato Pie

2 cups cooked and mashed sweet potatoes
2 tbsp. melted butter
½ tsp. vanilla
2/3 cup sugar
1/3 teaspoon salt
3 eggs
½ tsp. cinnamon
½ cup cream
1 unbaked pie shell

Preheat oven to 425°F. Prick pie shell dough with fork, and bake 10 minutes without filling. Combine all ingredients and mix well with an electric mixer until smooth. Pour filling into precooked pie shell and bake in 425-degree oven for 10 minutes. Reduce heat to 350 degrees and bake for an additional 35 minutes. Serve warm with whipped cream or ice cream.