In a large pot over medium heat, add 1 tablespoon of olive oil.
Once the oil is hot, add the chopped onion and sauté until translucent, about 5 minutes.
Add the minced garlic, grated ginger, turmeric, and black pepper. Cook for an additional 1-2 minutes, stirring frequently until fragrant.
Add the sliced carrots and diced celery to the pot, and sauté for another 5 minutes.
Add the chicken breast to the pot and pour in the low-sodium chicken broth. Toss in the bay leaf.
Bring the mixture to a boil, then reduce the heat to low and let it simmer for 20 minutes, or until the chicken is cooked through.
Once the chicken is cooked, remove it from the pot and shred it using two forks. Return the shredded chicken back to the pot.
Stir in the chopped kale (or spinach) and sliced mushrooms. Let it simmer for an additional 5 minutes until the greens are wilted.
Season the soup with salt to taste and finish with the lemon juice for a refreshing zing.