Crockpot Creamy Cauliflower Soup with Bacon

1 head cauliflower, rough chopped
2 leeks, sliced, leafy tops removed, optional
1 zucchini, diced
1 medium yellow onion, diced
1 carrot, diced
1 potato, diced
2 t. nutmeg
salt & pepper
6 c. chicken broth
1 lb. bacon, cooked and divided, chop half for broth
6 green onions
3 T. butter
2 T. oil
shredded cheese, optional

Place liner in crockpot. Place everything except cheese in crockpot. Cook on low 6-8 hours. Mash cauliflower. Serve in bowls with scallions, bacon, and cheese.