Press the Sauté button on an Instant Pot® and allow to heat until the display reads Hot. Place the butter, carrots, celery, and onion in the pot. Sauté 3 Minutes until fragrant. Pour broth into the pot and scrape the bottom of the pot with a wooden spoon to remove any browned bits. Add chicken, salt, pepper, garlic powder, and thyme. Press the Cancel button.