In a medium saucepan over medium-high heat, warm the coconut oil. Add the onions and bell peppers and sauté for 10 minutes, or until soft.
Raise the heat to medium-high and add the chicken broth, chicken, spinach, green onions, and salt. Stir until well combined and bring to a boil.
Reduce the heat to medium-low, cover, and simmer for at least 5 minutes to allow the flavors to meld. Remove from the heat.
Serve warm garnished with the avocado and cilantro.