Make the broth by simmering the vegetable broth, kelp, and wakame in a pot for about 15 minutes while you start the chowder.
Heat the oil in another large pot over medium heat. Add the carrots, celery, and onion. Cook, stirring occasionally until vegetables have softened, 8 to 10 minutes. Add the garlic, thyme, and Old Bay Seasoning and cook for another couple of minutes until garlic is fragrant.
Strain the broth into the pot with the vegetables. Stir in the potatoes, mushrooms, crushed tomatoes, tomato paste, syrup, and bay leaves. Bring the soup to a boil then reduce heat to simmer, partially cover, and cook until the potatoes are just tender, about 15 minutes.
Remove and discard the bay leaves. Taste and add salt and pepper as needed. Serve immediately.
Thank you, Chef Linda. It tastes liked the sea! Loved this. I have been craving the Manhattan Clam Chowder of my childhood. I only had Crimini mushrooms so I used fewer and added a can of hearts of palm which was great. Added a tad more smoked paprika and a tad of cayenne pepper. A little bit of lemon juice when things got out of control. I made GF/vegan oyster crackers for some salty crunch. Made them from scratch. Still perfecting that.