I don't put butter or milk in my mash and eat it like the poncey chefs now called "crushed" - find it slimy otherwise and has the bonus of being better for me
. Have often frozen the remainder with all sorts of different types of potatoes and it works fine. Usually use it in things like fish cakes but it's not really much different to when it went in so maybe the way to go is not to add the butter (or whatever) until defrosted.

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