Heat the avocado oil in a Dutch oven or stock pot over medium heat. Add the chopped chicken and brown 3 to 5 minutes, until much liquid is seeping out. (note: if you're adding onion and garlic, do so now with the chicken!)
Stir in the seasonings (chili powder, oregano, basil, ginger, cinnamon and sea salt), carrots and bell pepper and continue cooking 1 to 3 minutes, until spices are fragrant.
Add the pumpkin puree and chicken broth, cover and bring to a full boil. Reduce heat to a simmer and cook 15 minutes.
Remove cover, add the chopped heirloom (or vine-ripened) tomato and continue cooking at a gentle boil, stirring occasionally, until chili reaches desired thickness, about 20 to 30 minutes.
Serve chili with choice of toppings. I serve with coconut milk yogurt and chives!
Notes
If you don't follow a Low-FODMAP diet, add 1/2 cup to 1 cup of chopped yellow onion and 3 cloves of minced garlic.