Begin by whisking together the broth, soy sauce, honey, garlic, and pepper until combined. Then pour the soy mixture into the Instapot and place the chicken breasts inside. Next, seal the lid and steam valve and cook according to the manufacturer's instructions, but setting the timer to 10-12 minutes usually does the trick. The Instapot will build pressure, seal, then count down until the timer runs out. Allows the pressure to naturally release for at least 10 minutes before manually releasing the rest.