Soak cashews in water for 4 hours or quick-soak in hot water for 10 minutes to soften them for blending.
Drain and rinse the cashews thoroughly to remove excess starch and improve flavor clarity.
Blend cashews with water until smooth and creamy, scraping down sides as needed.
Add nutritional yeast, lemon juice, vinegar, garlic powder, onion powder, and salt, then blend again until fully combined.
Adjust consistency by adding small amounts of water until desired texture is reached.
Mix in optional ingredients like olive oil or mustard, then let rest briefly before serving.