Yes! To freeze mashed potatoes, cool completely and pour into a freezer-proof resealable bag. Freeze for up to 3 months. To reheat, thaw mashed potatoes in the refrigerator. Once thawed, pour potatoes into a saucepan and heat over medium-low heat. Add a couple tablespoons of cream and butter and stir frequently until heated through. Re-season with salt and pepper as needed.