Remove/discard skin, bones, and cartilage from the chicken. Shred the meat, and set aside.
Heat oil (2 tablespoons) in a large heavy-bottom pot over medium heat.
Once shimmering, add chopped onions (2 cups) and peeled + chopped carrots (2 cups). Saute until soft, about 5-7 minutes.
Stir in minced garlic (4 cloves), chopped thyme (1 tablespoon), 1 tablespoon chopped sage, salt (1 1/2 teaspoon ), and pepper (1/2 teaspoon). Cook until fragrant, about 2 minutes.
Add chicken broth (32 ounces), chopped kale (8 cups), chicken, lemon juice and lemon zest and stir to combine.
Bring soup to an aggressive simmer, and cook until kale is wilted to your liking and the soup is heated through.
Taste seasoning and adjust to taste.
Serve with freshly grated parmesan and enjoy!