Put chicken in bottom of Instant Pot inner pot. I used frozen chicken breasts.
Add chicken broth, pepperoncini, pepperoncini juice, gravy mix, ranch mix and butter. Close the lid and lock.
Set pressure to high for 15 minutes. If using fresh chicken breasts set pressure to 8 minutes.
Once chicken is done cooking, let pressure naturally release then open the lid.
Take chicken out and shred it.
Once shredded, add chicken back in sauce. If you want a thicker mixture for sandwiches, set Instant Pot to saute setting and add 2 Tbs. of corn starch to 1/2 cup water and mix. Add corn sttarch mixture to chicken and stir until the sauce thickens.
Add Mississippi Chicken to rice or on sandwiches for the most delicious dinner!