Dreams dictionary: Potato
Dreams dictionary: Interpretation 1
To see potatoes in your dream represent your earthiness and simplicity. Alternatively, the dream may be a metaphor that you are being a "couch potato". In other words, you are being lazy. Or seeing a potato in your dream may also be a metaphor that some issue is like a "hot potato". A situation is being passed around instead of properly dealt with; nobody wants to handle the issue.
Dreams dictionary: Interpretation 2
To see or eat mashed potatoes in your dream suggest that you are experiencing concerns over financial matters.