Vegan Bone Broth (without the bones)

Name: Vegan Bone Broth (without the bones)
Prep time: 10 min
Cook time: 1 h
Total time: 1 h 10 min
Cuisine: American
Ingredients: Advertisement; Collagen powder (optional); 12 cups filtered water; 1 sheet kombu or handful of wakame seaweed; ½ cup dried shiitake mushrooms; ½ cup fresh mushrooms and stems; 1 whole onion, skin on, sliced in half; 5 garlic cloves, lightly crushed with the flat part of a chef's knife, skin on; Parsley or cilantro stems; 2-inch piece of ginger; 2 to 3 tablespoons collagen powder (optional)