Chicken and Gnocchi Soup

INGREDIENTS

• 1 tablespoon olive oil
• 1 small onion, diced
• 3 stalks celery, diced
• 3 cloves garlic, minced
• 2 carrots, shredded
• 1 pound cooked, cubed chicken breast
• 4 cups chicken broth
• 1 (16 ounce) package mini potato gnocchi
• 1 (6 ounce) bag baby spinach leaves
• 1 tablespoon cornstarch (optional)
• 2 tablespoons cold water (optional)
• 2 cups half-and-half cream
• salt and ground black pepper to taste