How Long to Cook Chicken Breast in a Slow Cooker on High
If you want to cook chicken breast in a Crock-Pot on the high setting, you'll need to leave it in for 2 to 3 hours. You can cook either thawed or frozen chicken breasts in your slow cooker, but you'll want to leave frozen ones in for longer to ensure that they're cooked through. Make sure to use a meat thermometer to be sure that the meat is completely cooked: It should register 165 degrees Fahrenheit when inserted into the thickest part of the chicken.