Is it safe to cook chicken before is completely defrosted?

No, cooking frozen chicken is not considered safe by the United States Department of Agriculture Food Safety and Inspection Service. Here's why:

1. Uneven Cooking: Frozen chicken may have uneven temperatures throughout the meat. When you cook frozen chicken, the outer parts might cook faster than the inner sections, increasing the risk of undercooked areas where harmful bacteria can survive.

2. Thawing Process: Cooking chicken while frozen can prolong the thawing process, potentially allowing bacteria to multiply. It is crucial that the chicken is fully thawed before cooking to ensure that it reaches a safe internal temperature throughout.

3. Food Poisoning Risk: Undercooked chicken is a significant source of foodborne illnesses. Consuming undercooked chicken, especially when it has been frozen, increases your risk of contracting foodborne illnesses caused by bacteria like Salmonella and Campylobacter, which can lead to symptoms such as fever, abdominal cramps, nausea, vomiting, and diarrhea.

4. Recommended Practices: To ensure the safety of your chicken, it's recommended to thaw it in the refrigerator, under running cold water, or using the defrost setting of your microwave (followed by immediate cooking) before cooking it. These methods effectively reduce the growth of harmful bacteria and ensure thorough and even cooking.

By following these safe food handling guidelines, you can minimize the potential food safety risks associated with cooking frozen chicken. Always make sure to cook chicken until it reaches an internal temperature of 165°F (74°C) to eliminate any potential harmful bacteria.