Bring the vegetable broth to a slow boil on the stove. Then add in the potato purée, tomato sauce, soy sauce, turmeric, and the oregano. Stir to incorporate.Add in the pasta shells and water, then stir again. Let it cook on high for 3 minutes with the lid off the pot.Stir again after 3 minutes and reduce the heat to medium-high; let it cook for 5-6 more minutes with the lid off, stirring occasionally to prevent sticking.One the pasta is fully cooked and al denté, turn off the heat. Put the lid on the pot, and let it sit for 10 minutes to thicken up and cool down enough to serve (it will thicken quite a bit, so don't skip this step).Serve in soup bowls and sprinkle each serving with the topping suggestions, if desired.Or, serve alone or with a side of your favorite veggies, or feel free to add 1 cup of greens such as spinach, kale, or another green veggie such as zucchini during the last 5-6 minutes of cooking if desired.