Hello Sallie,
Great idea - I do it all the time, especially when I need to make dozens of sweet potato pies! Cooked sweet potato mash will freeze best the less you've added to it. When it defrosts, it may be important to whisk it over a double boiler to re-incorporate the mass. You could also warm it slightly and give it a whirl in a food processor. My suggestion would be to put it in a glass or equally non-reactive "tupperware," with a tight fitting lid.
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Great idea - I do it all the time, especially when I need to make dozens of sweet potato pies! Cooked sweet potato mash will freeze best the less you've added to it. When it defrosts, it may be important to whisk it over a double boiler to re-incorporate the mass. You could also warm it slightly and give it a whirl in a food processor. My suggestion would be to put it in a glass or equally non-reactive "tupperware," with a tight fitting lid.