Best Chicken Spinach Artichoke Soup - How to Make Chicken Spinach Artichoke Soup

Ingredients

• 1 tbsp. extra-virgin olive oil
• 1/2 yellow onion, chopped
• 2 celery stalks, chopped
• 3 cloves garlic, minced
• 1/2 tsp. red pepper flakes
• Kosher salt
• Freshly ground black pepper
• 6 c. chicken broth
• Juice of 1/2 lemon
• 1 1/4 lb. boneless skinless chicken breasts (about 3 large breasts)
• 1 (14-oz) can artichoke hearts, drained and quartered
• 1 c. shredded mozzarella
• 1 c. freshly grated parmesan, plus more for garnish
• 2 tbsp. heavy cream (optional)
• 4 c. fresh spinach
• 2 tbsp. freshly chopped parsley, for garnish