How Can You Tell If Mashed Potatoes Are Bad?
If mashed potatoes have a sour smell, or are discolored, slimy, or have mold growing on them, they are most likely bad and should be discarded. Additionally, if they have been left sitting out at room temperature for more than two hours, they may have started to spoil and should not be eaten. It’s always better to be cautious and throw away suspect food rather than risk getting sick.