9 inch baked pastry shell/1 baked 9-inch graham cracker crust
Microwave butter in a small glass dish at HIGH 15 seconds.
Combine marshmallows and milk in a 2-quart glass casserole.
Microwave at MEDIUM I 1/2 to 2 minutes.
Stir mixture after 1 minute.
Stir in pumpkin, cinnamon, nutmeg, allspice, and melted butter.
Fold in whipped cream.
Pour into baked crust.
Chill for 3 hours.