Italian Sausage and Kale Vegetable Soup (Paleo, Whole30, Keto)

sweet italian sausage (spicy works too if you like!)

olive oil

large yellow onion, diced

large carrots, chopped

stalks of celery, chopped

medium zucchini, chopped

garlic, grated or finely minced

-ounce can diced tomatoes

chicken stock (64 ounces)

thyme (fresh or dried)

salt + pepper (or more to taste)

bay leaf

bunch of kale, stem removed and leaves chopped