Rub mushrooms with a damp towel to wipe off any dirt. Slice thinly and set aside.
Bring a large pot of water to a boil for the pasta. Once water has boiled, add pasta and cook according to package directions.
While water boils, heat a large skillet over medium. Add cooking spray or a little bit of oil to the skillet. Sauté cremini mushrooms for about 10 minutes, until browned and soft.
Using a kettle, bring at least 3/4 of a cup of water to a boil.
In a high-speed blender, add HALF of the cremini mushrooms, cashews, nutritional yeast, olive oil, parsley, thyme, garlic, salt, pepper, and boiling hot water. Blend on high until very smooth, adding more boiling water as necessary. This should only take a couple minutes!
Drain pasta and return to pot. Stir in the pasta sauce and toss until well coated. Serve with the other half of the sautéed cremini mushrooms over top and enjoy immediately! Feel free to adjust seasonings, or add an extra sprinkle of nutritional yeast and parsley before serving.