Start off by placing your chicken breasts into the metal pot. Cover the chicken breasts in BBQ Sauce. Try to cover the whole thing. Add broth or water to the pot. (Reserve some sauce for topping the sandwiches.)
On Manual at high pressure, set the timer for 10-16 minutes depending on how much chicken and how thick the breasts are. Allow the Instant Pot to release pressure naturally.
Shred up the chicken in the Instant Pot. If you want to thicken up the sauce, you could turn on the Sauté function for a few minutes being sure to stir continuously.
Slice buns in half, and scoop about 1/3 to 1/2 cup of shredded chicken onto each bun. Add more BBQ sauce if desired. Enjoy!