Is it safe to leave a custard pie out?

It's generally not safe to leave a custard pie out at room temperature for extended periods. Here's why:

* Bacteria Growth: Custard is a rich, protein-rich food that bacteria love. Leaving it out at room temperature allows bacteria to multiply rapidly, potentially causing food poisoning.

* Spoilage: The ingredients in custard can spoil quickly, leading to an unpleasant taste and texture.

* Temperature Danger Zone: The "danger zone" for bacterial growth is between 40°F and 140°F. Room temperature falls within this range.

Here's what you should do:

* Refrigerate immediately: After baking, cool the custard pie completely and refrigerate it.

* Limit time out: If you need to leave it out, try to keep it for no more than 2 hours.

* Keep it covered: A lid or wrap helps prevent bacteria and other contaminants from entering.

* Trust your senses: If the custard pie has an off smell, taste, or texture, discard it.

In general, it's best to err on the side of caution and refrigerate your custard pie. This will help ensure it stays safe and delicious to eat.