Put the potato, sweet onion, carrot, celery in a large crock pot. Put the mushrooms on top of the other veggies. It will seem very full, but it will cook down significantly.
Add the spices, broth salt and pepper. Stirring some, but allow the potatoes to remain at the bottom submerged in the broth.
Cook on high 4 hours or low 8 hours. Stir well once the mushrooms cook down.
Turn the heat down to low and stir in the greek yogurt.
Drizzle with balsamic or mix it in!
Notes
Use dairy-free yogurt or omit if vegan. The mushrooms will cook down a lot!