Veggie Veggie Vegan Soup

Name: Veggie Veggie Vegan Soup
Ingredients: 1 medium onion, chopped; 2 tablespoons olive oil; 1 large Portabella mushroom cap, chopped; 5 cups water; 1 tablespoon veg. broth powder (Gaylord Hauser's); 2 tablespoons dried natural soup greens or equiv.; 3-4 large bay leaves; 1 teaspoon salt; 2-3 cloves garlic, crushed; 1 pound potatoes, cleaned, peeled and cubed into 1/2 inch size.; 1/2 pound green beans, cut, fresh or frozen; 1/2 pound cauliflower florets as optional ingredient