Add the boneless and skinless chicken breasts into the liner of the Instant Pot.
Combine the vinegars, sugar, Worcestershire sauce, mustard, and the spices together and pour on chicken.
Close the lid and set the Instant Pot to the MANUAL/PRESSURE COOK setting and cook.
Allow the pot to naturally release pressure for 10 minutes before removing the lid.
Use a handheld mixer to shred the chicken. The liquid in the pot will be soaked back by the chicken.
FOR THE FULL RECIPE