Step 1: In a large pot or Dutch oven, heat a drizzle of olive oil over medium heat. Add the finely chopped onion and sauté until it becomes translucent, about 5 minutes.
Step 2: Stir in the chopped tomatillos, Mexican oregano, ground cumin, salt, and fresh-ground pepper. Cook for an additional 3-4 minutes until the tomatillos soften slightly.
Step 3: Add the can of Ro-Tel Diced Tomatoes and Green Chiles and the 4 oz. can of diced green chiles. Stir well to combine.
Step 4: Pour in the chicken stock. Bring to a gentle boil, then reduce the heat to a simmer for about 15 minutes.
Step 5: Stir in the diced cooked chicken breast and frozen cauliflower rice. Let the soup simmer for an additional 10 minutes until heated through.
Step 6: Remove from heat and stir in the chopped fresh cilantro and lime juice. Adjust seasoning if needed.
Step 7: Ladle the soup into bowls and top with diced avocados, fresh lime wedges, and extra cilantro if desired.