Turn the Instant Pot on to “saute” and melt the ghee. Saute the onion and bell peppers with a pinch of sea salt for about 5-7 minutes until fragrant and soft. Add the garlic and cook for 1 minute.
Turn the Instant Pot “off,” and stir in the taco season and potato starch until the veggies are coated. Stir in the tomatillos, zucchini, broth, and coconut milk, and then set the chicken breasts in the liquid.
Put the lid on the Instant Pot, and close the valve. Turn the IP on to “Soup,” and bring the time down to 20 minutes. The IP will take about 5 minutes to come to pressure before counting down the 15 minutes. When the 15 minute timer is up, turn the IP off and let it naturally release for 5-10 minutes before releasing the rest of the valve pressure.
Take the chicken breasts out of the IP, shred them with a fork, and then return the shredded chicken to the IP, stirring the chicken into the chili. Season the chili to your taste and garnish each bowl with cilantro, lime, and avocado slices per your preference.