Set the Instant Pot to "Pressure Cook" for 20 minutes and melt the coconut oil. Add the onions, celery, and all of the spices. Stir to coat with the fat and allow the vegetables to begin to sweat, about five minutes
Add the chicken and broth, put on the lid, and allow the pot to come up to pressure. When the 20 minutes have elapsed, unplug the machine and release the pressure manually.
Add the zucchini and Sunbutter, replace the lid, and let sit for about ten minutes as the zucchini gently cooks, and the Sunbutter melts. Then stir until the sauce is creamy. If the stew cooled off too much you may need to set it to "Saute" for another few minutes to heat it through.
Serve with diced avocado and cilantro for garnishes. Or, portion the stew into glass freezer containers and freeze for later.
To make this recipe in a stock pot over the stove: Place the fat, onions, celery, and spices in the pot over medium heat. Stir to combine and cook for five minutes. Add the chicken and broth, cover, and bring to a low boil. Cook for 20 minutes, stirring occasionally. Add the zucchini and Sunbutter and cook for an additional five minutes. Serve with avocado and cilantro for garnishes.