Turn on the Instant Pot, then choose the Sauté program and the Normal setting. Season chicken with salt and pepper and place the lemon and rosemary in the cavity.
Once the Instant Pot has come up to temperature, add oil. Lower chicken into the pot and sear on all sides, about 2 minutes per side.
Remove chicken and add potatoes, onion, celery, carrot, and garlic. Cook for 2 minutes, then add broth.
Return chicken to the pot and close the lid and the vent, then choose the Manual program and set the pressure to High or use the Poultry setting. Set the timer for 25 minutes. Once 25 minutes is up, naturally release the pressure for 30 minutes.
Placing chicken breasts over a bed of lemon slices is an easy and affordable way to infuse a ton of fresh flavor. Limes and oranges work well too!
This is by no means the only seasoning rout you can go. Craving Mexican? Try 1 teaspoon chili powder, 1/2 teaspoon cumin, and 1/2 teaspoon onion powder. Feeling Italian? Try 1 teaspoon dried oregano and 1/2 teaspoon garlic powder. The flavor combinations are endless. Just remember that in the world of spices, a little bit goes a long way.