Thai Chicken Coconut Soup

Name: Thai Chicken Coconut Soup
Prep time: 10 min
Total time: 10 min
Cuisine: Asian, Thai
Ingredients: 1 tbsp. neutral oil, such as canola or vegetable; 1 tbsp. freshly minced ginger; 4 oz. shiitake mushrooms, chopped; 6 c. low-sodium chicken broth; 1 (14-oz.) can coconut milk; 1 tbsp. fish sauce; 1 lb. boneless skinless chicken thighs, cut into 1" pieces; 1 lime, juiced; Cilantro leaves, for garnish; Chili oil, for garnish (optional)