Add olive oil to a large saute pan, and heat to medium. Add carrots, celery, and onion, and cook for a few minutes until the onion is translucent and veggies are fragrant. Add garlic and saute another 1-2 minutes. (Transfer mirepoix to the bowl of a slow-cooker, if using. Otherwise, transfer mirepoix to a large pot for stovetop preparation.)
Carefully pour chicken stock into the pot, and stir to combine. Add cooked chicken, lemon zest, salt, pepper, and dill. (If using the slow-cooker method, this part of the soup can be simmered on low all day. Your kitchen will smell delicious! If using the stovetop method, proceed with the following steps for a faster prep.)
About 5 minutes before serving, add the cooked tortellini to the soup. Stir to combine.
Spoon soup into bowls, and garnish with your favorite toppings. I like to use a squeeze of fresh lemon juice, a little extra dill, and maybe an extra crack of black pepper.
Chicken & Cheese Tortellini Soup with Lemon and Dill https://www.rootandbloomforever.com/soul-warming-homemade-chicken-soup/