Heat a large skillet over medium heat. Once hot, add olive oil, onion, and garlic, and sauté until onion is translucent. ( About 5 mins )
Drain the soaking cashews, and add to a high powered blender along with the onions/garlic, unsweetened plant milk, vegan parmesan, nutritional yeast, lemon juice, the. Blend until very smooth.
Add salt and pepper to taste
Serve over your favorite pasta.