Slow Cooker Red Lentil, Fennel and Chicken Soup

Ingredients

• 2 onions ((chopped))
• 3 cloves garlic ((minced))
• 1 large fennel bulb ((cored and chopped; about 1 1/2 cups))
• 2 large carrots ((peeled and chopped; about 1 cup))
• ½ pound dried red lentils
• 1 teaspoon ground cumin
• 1 teaspoon ground coriander
• 2 pounds boneless skinless chicken breasts ((diced small))
• 5 cups less-sodium chicken broth
• 1 28-ounce can crushed tomatoes
• Kosher salt and freshly ground black pepper ((to taste))
• ½ cup roughly chopped fresh parsley ((plus more to serve if desired))