Vegan Sauerkraut Soup (sauerkrautsuppe) with Chickpeas and Mushrooms

In a large dutch oven over medium-low heat, add the olive oil, mushrooms, Tamari, nutritional yeast, maple syrup, black pepper, and yellow onion. Cook the mushroom and onion mixture with occasional stirring until the onions and mushrooms are dark brown, caramelized, and sticking to the bottom of the