Can I still eat an egg tart after leaving it out overnight?
In general, it is not recommended to eat egg tarts left overnight. The detailed explanation is as follows:

Egg tarts contain ingredients such as eggs and milk, which are prone to bacterial growth. If left in an environment with high room temperature, bacteria can multiply rapidly under suitable temperature and humidity conditions, leading to spoilage of the egg tart. Even if the egg tart is refrigerated, bacterial growth can only be slowed, not completely prevented. Spoiled egg tarts may develop an off odor, change color, or even become moldy, potentially causing food poisoning with symptoms such as nausea, vomiting, abdominal pain, and diarrhea after consumption. In addition, the texture and quality of the egg tart will also deteriorate after prolonged storage; the flaky pastry may become soft and soggy, and the filling might become sticky or dry, negatively affecting the eating experience.
Therefore, it is recommended to consume egg tarts immediately after they are made and avoid leaving them for extended periods. If immediate consumption is not possible, proper refrigeration is advised. Furthermore, it is best to avoid consuming food that has been left for too long to prevent unnecessary harm to the body.