Place all ingredients EXCEPT Greek yogurt in a slow cooker. Cook on low for 4-6 hours.
Once cooked, use 2 forks to shred chicken. Just before serving stir Greek yogurt into the entire batch of soup. Serve and top with shredded cheese and any other toppings desired
Instant Pot/Pressure Cooker Instructions:
For your instant pot or other electric pressure cooker place all ingredients except the greek yogurt in your pot, close lid and vent open. Set to poultry setting.
Let pressure release naturally. Use two forks to shred chicken, stir in Greek yogurt before serving. Serve and top with shredded cheese and any other desired toppings.