Remove and discard the green leaves from the cauliflower. Chop up the cauliflower into even sized pieces. It doesn't matter if it is pretty, because it will all just be blended anyways. Peel the garlic cloves, and leave them whole.Add the cauliflower, garlic, vegetable broth, and non-dairy milk to a big pot, and bring to a simmer. Cook for about 10 minutes, until the cauliflower is very soft and falls apart when pierced with a fork.Now blend up the cauliflower mixture. You can use an emersion blender and blend everything together directly in the pot, or you can use a standing blender and blend the cauliflower and cooking liquid in batches, being careful not to fill the blender too high so the hot liquid doesn't explode out the top. Add the nutritional yeast, white miso paste, and salt and blend to combine.If you find your sauce is too thin, return the sauce to the pan and cook it down a bit more stirring often so it doesn't burn. If it is too thick, add a bit more vegetable broth or water.The ways to use this sauce are endless. Toss with pasta, mix into a casserole, top on pizza, make creamy scalloped potatoes, drizzle over baked potatoes, use in lasagna, you name it!