In a blender, add soaked/strained cashews, nutritional yeast, garlic, lemon juice, water, onion powder (if using), and salt. Blend until creamy and smooth.
*Cashews must be soaked in advance, otherwise pour boiling water over cashews in a bowl and let sit for 1 hour. If you do not have time for this, or if you can’t have nuts, you can also substitute the cashews for hemp hearts. Hemp hearts require no soaking before use.