In a small bowl, whisk together the broth, dressing, and 1/2 cup of the bbq sauce. Pour into the bottom of the instant pot.
Season chicken with salt, pepper, garlic powder, onion powder and paprika and add to the pot.
Seal the instant pot and make sure you've closed the pressure valve. Cook the chicken on HIGH pressure for 10 minutes. Natural release for 5 minutes then quick release the remaining pressure.
Once all pressure is released, add remaining bbq sauce and shred with two forks. Serve as desired.
Notes
You can swap breasts for boneless, skinless thighs, just add about 7 minutes to the cook time.
For frozen chicken, it will take longer to come up to pressure and you'll need to add 5 minutes to the cook time.
To double the recipe: Add 5 minutes to the cook time. It will take about 10 minutes to come up to pressure, then cook for 15 minutes, then natural release for 5 minutes and finish with quick release.