Thinly chop up your onion and garlic. Add a tablespoon of broth if sauce is too thick. The best dairy-free cauliflower alfredo recipe features creamy vegan cauliflower alfredo sauce with blended cauliflower, garlic, onion and nutritional yeast. 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. In a large sauté pan, melt your vegan butter. 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. This simple number combines cauliflower, cashew milk, and nutritional yeast for an entirely plant-based rendition of a classic alfredo. If youâve been looking for a creamy, vegan pasta sauce recipe, look no further.