Marshmallow Pumpkin Pie

1 heaping cup pumpkin
1 (10 ounce) package marshmallows
1/2 teaspoon salt
1 heaping tablespoon butter
1 teaspoon pumpkin pie spice
1 baked 9-inch pie shell

Put pumpkin in double boiler. Pour in marshmallows on top. Add salt, butter and pumpkin pie spice. Stir over low heat until marshmallows have melted. Pour into pie shell. Cool.

Serve with whipped cream.