For shredded chicken: Cook the chicken on HIGH pressure for 15 minutes and natural release for 5 minutes. For chicken that shreds easily with a fork, you’ll need just a few more minutes of cooking and natural release. Seal the cooker and make sure the pressure valve is closed. Set to HIGH pressure for 15 minutes. For fresh chicken, the cooker will take about 10 minutes to come to pressure. Expect frozen chicken to take 12 to 15 minutes to come to pressure. When the 15 minute cook time is up, do a natural release of pressure for 5 minutes before quick releasing any remaining pressure.