Is it okay to eat mashed potato that was out over night?

It's not recommended to eat mashed potatoes that have been left out overnight. Here's why:

* Bacteria Growth: Mashed potatoes, especially if they contain dairy products like milk or butter, are a breeding ground for bacteria at room temperature. This can lead to food poisoning, causing symptoms like nausea, vomiting, and diarrhea.

* Spoilage: The potatoes themselves can start to spoil, becoming mushy, discolored, and developing an unpleasant odor.

Even if the mashed potatoes look and smell fine, it's best to err on the side of caution and throw them away.

Here are some tips to prevent foodborne illness:

* Refrigerate promptly: Always refrigerate mashed potatoes within two hours of preparing them.

* Reheat thoroughly: If you do choose to reheat leftover mashed potatoes, make sure they reach an internal temperature of 165°F (74°C) for at least 15 seconds.

* Observe for signs of spoilage: If the mashed potatoes have an off smell, taste, or appearance, discard them.

In short, it's not worth the risk. Your health is more important than saving a few leftover mashed potatoes.