How do I know the chicken is cooked through when I can’t see it? Small chicken breasts will take roughly 20 minutes, medium about 25, and very large breasts may take up to 30 minutes. Because all ovens vary, you may check by inserting a quick-read thermometer through the top of the packet and into the thick end of the chicken breast. It should read 160℉, as carryover cooking will take the internal temperature to the recommended temp of 165℉. You can also carefully unfold the packet if you prefer—just be careful of the hot steam that will escape. Ovens do vary, so check on the early side until you’re sure these times align. And if for any reason your chicken seems tough or dry, shorten the cooking time the next time. Chicken can cook through more quickly than we may think, and this chicken will be deliciously tender when just cooked through.
Can I cook tenders and cutlets this way? You can. The smaller size will mean they cook faster, so start checking around the 12-minute mark.