What's the plural form of mashed potato? Here's the word you're looking for.
Answer
The noun mashed potato can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be mashed potato.
However, in more specific contexts, the plural form can also be mashed potatoes e.g. in reference to various types of mashed potatoes
or a collection of mashed potatoes.
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