In a small bowl mix together all spices: 1 tablespoon chili powder, 1 teaspoon smoked paprika, 1 teaspoon cumin, 1 teaspoon oregano, 1 teaspoon salt, ½ teaspoon black pepper and ¼ teaspoon cayenne (if using).
Heat the olive oil in a Dutch oven or a heavy-bottomed pot and add diced onion. Cook for a few minutes until transluscent, then add minced garlic and cook 1 minute, stirring, until fragrant.
Add tomato paste and ground chicken, and sprinkle with the spice mix. Cook together, breaking the meat with a wooden spoon until lightly browned, 5-7 minutes.
Now add chicken broth, fire roased tomatoes, green chiles, drained kidney beans and diced red bell pepper.
Bring to a boil, then turn down to simmer and cook partially covered for 25-30 minutes.
Give the chili a stir and taste - if it needs more seasoning, add more salt and pepper.
Serve hot with a dollop of sour cream, sliced avocado, shredded cheddar cheese (or crumbled cotija) and fresh cilantro leaves.