Season the chicken breasts with the seasonings (including the cocoa powder).
Add the seasoned chicken to the pot. Next, add the chicken broth, 1/4 cup of BBQ sauce, and liquid smoke.
Put the lid on the pot and adjust the settings to the Meat Setting. 10 minutes should be the default. Leave it at 10 minutes.
Allow the Instant Pot to release steam on its own without quick release.
Remove the chicken from the Instant Pot. Using a knife and fork, shred the chicken.
Remove the chicken broth and BBQ sauce mixture from the Instant Pot with a ladle. Drizzle the sauce over the pulled chicken.
Toast the buns (optional)
Add the chicken to the buns.
Drizzle the remaining sauce throughout. Top with sliced red cabbage.