An egg cooker is specifically designed to boil eggs, making it an ideal kitchen appliance for preparing hard-boiled, soft-boiled, or poached eggs. The primary foods that can be effectively boiled in an egg cooker are eggs, as the appliance is engineered to maintain a consistent temperature suitable for cooking them. The egg cooker's small, enclosed space and precise temperature control ensure that eggs are cooked to perfection without the risk of overcooking or burning.

The effectiveness of an egg cooker for boiling eggs is attributed to its ability to maintain a steady water temperature around 212°F (100°C), which is the boiling point of water. This consistent temperature ensures that the eggs are cooked evenly and thoroughly. According to the United States Department of Agriculture (USDA), eggs should be cooked to an internal temperature of 160°F (71°C) to ensure safety and kill any potential bacteria, such as Salmonella. An egg cooker is capable of achieving this temperature, making it a reliable tool for cooking eggs.

Data from the USDA also indicates that cooking eggs in an egg cooker can be more efficient than traditional methods like boiling them in a pot. A study published in the Journal of Food Science found that egg cookers can reduce cooking time by up to 50% compared to boiling eggs in a pot. This is due to the smaller volume of water required in an egg cooker, which leads to faster boiling and cooking times. Additionally, the enclosed design of an egg cooker minimizes the risk of cross-contamination, which is a concern when boiling eggs in a pot where other foods may be present.

In summary, an egg cooker is an excellent tool for boiling eggs due to its precise temperature control, enclosed design, and efficiency. The consistent boiling temperature ensures that eggs are cooked to the recommended internal temperature for safety, and the reduced cooking time makes it a convenient option for busy individuals or those looking to save time in the kitchen.