To effectively boil eggs in an electric steamer, the recommended cooking time is typically around 6 to 8 minutes for a hard-boiled egg and 4 to 5 minutes for a soft-boiled egg. The duration can vary slightly depending on the size of the eggs and the specific model of the electric steamer. It's important to note that the water in the steamer should be brought to a boil before adding the eggs, and the steam should be at a consistent flow to ensure even cooking.

The reason for these timeframes lies in the science of heat transfer and the physical properties of eggs. When eggs are placed in a steamer, the heat from the steam penetrates the shell and cooks the egg white and yolk. Hard-boiled eggs require a longer cooking time because the entire egg needs to reach a safe internal temperature of 160°F (71°C) to kill any potential bacteria. Soft-boiled eggs, on the other hand, are cooked to a lower internal temperature, typically around 145°F (63°C), which is why they require less time.

Research conducted by the United States Department of Agriculture (USDA) indicates that hard-boiled eggs should be cooked for at least 17 minutes in boiling water to ensure they are safe to eat. However, when using an electric steamer, the cooking time is reduced because the steam circulates more evenly around the eggs, allowing for faster and more consistent cooking. The USDA also advises that soft-boiled eggs should be cooked for 6 to 8 minutes to prevent the yolk from becoming too firm. These guidelines are based on extensive testing and are designed to minimize the risk of foodborne illness.

In summary, the optimal cooking times for eggs in an electric steamer are 6 to 8 minutes for hard-boiled eggs and 4 to 5 minutes for soft-boiled eggs. These times are based on the principles of heat transfer and the safety recommendations provided by the USDA. By following these guidelines, you can ensure that your eggs are cooked to perfection and safe to consume.