Add a tablespoon of broth if sauce is too thick. In a large sauté pan, melt your vegan butter. If youâve been looking for a creamy, vegan pasta sauce recipe, look no further. This simple number combines cauliflower, cashew milk, and nutritional yeast for an entirely plant-based rendition of a classic alfredo. Transfer cauliflower, garlic, almond milk, broth, nutritional yeast, onion powder, salt and pepper to a blender (or food processor) and blend until smooth, about 30 seconds. Thinly chop up your onion and garlic. The best dairy-free cauliflower alfredo recipe features creamy vegan cauliflower alfredo sauce with blended cauliflower, garlic, onion and nutritional yeast. 1 tablespoon vegan butter 1/3 cup nutritional yeast 1/4 cup vegan cream cheese 1 - 1/2 cups plant milk 1/2 lemon 1 tsp salt 1/4 tsp pepper Instructions.