In a large Dutch Oven Pot, heat olive oil over medium-high heat.
Add celery, red onion and sauté for 3 minutes. Then, add garlic and sauté for 30 seconds longer.
Add ground turkey and cook, breaking up the turkey with a wooden spoon, until the turkey is cooked through, about 5 minutes.
Add red pepper flakes, cumin, paprika, coriander, salt, and pepper to taste. Mix everything well.
Add red bell pepper, mushroom, sweet potato, butternut squash, diced tomatoes, tomato sauce, and chicken broth.
Stir mixture, cover with a lid and bring to a simmer. Cook the chili for 30 minutes.
Serve with fresh chopped cilantro, jalapeño, and avocado on top.