Preheat oven to 450.Brush chicken with olive oil and season generously with salt and pepper.Bake for 45-60 minutes.Let chicken cool and then shred.In a large pot, add diced vegetables, cooked rice, shredded chicken and chopped cilantro and enough chicken broth to cover the ingredients.Bring to a simmer. Cover and simmer just until carrots are slightly tender. You want the vegetables to maintain a little bit of crunch.Taste the soup and add fresh black pepper, salt and red pepper flakes if needed.Place soup into a serving bowl and squeeze a lime wedge over the soup. Add a half diced avocado and fresh cilantro.Serve and enjoy!