Mix coriander, oregano, cumin, paprika, red pepper flakes, salt and pepper in a bowl. Add chicken to the slow cooker. Sprinkle the mixed spices over the chicken.
Add chicken broth, beans, green chili, and garlic. Mix everything well, cover the slow cooker and cook for 7 to 8 hours until the chicken is cooked.
Mix the heavy cream and masa harina in a bowl and set aside.
Take the chicken out of the slow cooker and shred with the help of two forks.
Return the chicken to the slow cooker. Add masa mixture andcorn. Cover the cooker and cook for 25-30 minutes until the sauce is thickened.
Transfer the chicken chili to bowls and top with grated cheese and chopped avocado. Serve with lime wedges and enjoy the chicken chili.