A cup of cubed rotisserie chicken weighs about 4-5 oz. You can use any precooked chicken or even drained canned chicken. If you don't have some precooked or rotisserie chicken, you can cook a medium-sized skinless boneless chicken breast will get you about 1 1/2 to 2 cups. Cook a raw chicken breast in the oven for about 30 minutes to bake to 165°.