Place the chicken breast, chicken broth, crushed tomatoes, onion, bell pepper, black beans, and corn into a large pot.
Stir in the chili powder, cumin, garlic powder, sea salt, and black pepper until the spices are evenly distributed.
Bring the mixture to a gentle boil over medium-high heat, then reduce the heat to low and cover.
Simmer for 20 to 25 minutes or until the chicken is cooked through and the vegetables are tender.
Carefully remove the chicken breast from the pot and shred it using two forks on a clean cutting board.
Return the shredded chicken to the pot, stir in the fresh lime juice, and serve warm in a bowl.
Top each serving with a dollop of Greek yogurt and the sliced avocado for a creamy finish.