"This is a gluten-free, dairy-free, soy-free, and vegan sour cream substitute...and it's absolutely delicious! You can sub this in for sour cream in any recipe! Store in the refrigerator in an airtight container for up to a week."
Place cashews in a bowl and cover with water. Soak until soft, at least 4 hours but preferably overnight.
Drain and rinse cashews; place in the bowl of a food processor. Add apple cider vinegar, salt, garlic powder, and onion powder. Blend until smooth and creamy, occasionally scraping down bowl sides with a spatula, 3 to 5 minutes.