Put the cashews, ½ cup sweet potato, 1 teaspoon dry yellow mustard, 3 teaspoon apple cider vinegar, 2 tablespoon nutritional yeast, 1 ½ teaspoon salt, ½ teaspoon onion powder, 2 teaspoon miso paste, and ½ to ¾ cups (start with a ½ and add more until you get the desired consistency you’re looking for) milk in the blender and blend on a high speed until the sauce is thick and creamy. You shouldn’t be able to see or feel any pieces of the cashews. If you do, scrape the sides and keep blending until it’s smooth and creamy.