Chicken Leek Soup Chicken Leek Soup Advocate staff photo by HEATHER MCCLELLAND -- Warm up with Chicken Leek Soup. julie kay Feb. 05, 2014 Comments ADVOCATE-TESTED RECIPE Chicken Leek Soup Serves 8 to 10. Recipe is by Julie Kay. 1 (14½-oz.) can diced tomatoes 1 (14½-oz.) can chicken broth 2 medium potatoes, cut into cubes, unpeeled 2 carrots, peeled and sliced 1 leek, sliced 2 stalks celery, chopped 3 chicken breasts or thighs, bone-in 1 tbl. Creole seasoning 1 tsp. black pepper 1. Put all ingredients into slow cooker and cook on Low for 6 to 8 hours. 2. Remove skin and bones from chicken, return chicken pieces to soup and serve.