Place chicken into Instant Pot cooking pot and sprinkle on Ranch seasoning mix.
Whisk together mayonnaise, heavy cream and vinegar and pour over chicken.
Pour barbecue sauce into cooking pot and gently mix the sauce over the top of the chicken.
Lock on lid and close pressure valve. Cook at high pressure for 4 minutes. When beep sounds, wait 5 minutes and then carefully release the rest of the pressure.
Use an electric hand held mixer, pulled meat claws or two forks and shred the chicken. The liquid will absorb into the chicken as it is being shredded.
Pile Instant Pot BBQ Ranch Chicken onto hamburger buns and top with Easy Coleslaw.