Start by heating olive oil in a large soup pot over medium heat. Add your sliced carrots, celery, and minced garlic. Let them cook for about 3 to 5 minutes until they soften and release their wonderful aroma. This step builds a flavorful base for your soup.
Once the veggies have softened, pour in the chicken broth. Stir well and bring the liquid to a gentle simmer. The broth will absorb the veggie flavors and start to develop a comforting, savory depth.
Now, stir in the cheese tortellini. Let it cook directly in the simmering broth. It should only take about 6 to 8 minutes to become tender. Be careful not to overcook—tortellini can get mushy fast.
When the tortellini is just about done, add your shredded chicken and fresh spinach leaves. Stir everything together and let it cook for another 2 to 3 minutes until the spinach wilts and the chicken is heated through.
Remove the pot from heat and let the soup sit for a minute. Then ladle it into bowls and serve hot. Garnish with freshly cracked black pepper or a sprinkle of parmesan cheese if desired.