Need cooked chicken for a recipe? You can purchase it already cubed and cooked in the freezer section of your supermarket—just thaw and use. Look for fully cooked roasted chicken strips in the meat department—just cut up and use. Or, purchase a boneless, skinless chicken breast and poach it. To poach a chicken breast, place 12-ounce boneless skinless chicken breast and about 1 1/2 cups water in a large skillet. Bring to boiling. Cover; cook 12-14 minutes or until the chicken is no longer pink.