2 (16 oz.) cans pumpkin pie filling
Pie crust
1 pkg. marshmallows
1 (10 oz.) container Cool Whip

Mix the pumpkin pie filling and marshmallows together in a saucepan and heat until the marshmallows are melted. Remove from heat and let cool for 20 minutes. Add the Cool Whip and mix well. Put in already baked pie shell.