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You don't even really need milk for mashed potato, just put extra butter in.
What uh... What do you suppose butter is made of?
I think you're missing the point, it's not like people make mashed potato by churning a bunch of milk into butter.
I'd even suggest that butter is the more vital ingredient.
Palm oil, everyone knows it.
That's margarine.
I can't believe it's not butter!
Are you really the sort of tard that if someone asks if you have milk you say yes because you have butter?
That only makes sense if you also have buttermilk, otherwise you're missing the rest of what makes milk... milk.
You can go from milk to butter in a pinch (put it in a container and shake for 10 min or so), you can't go the other way.