Combine the milks, garlic, nutritional yeast, and salt in a small pot just over medium heat.
Mix and bring to a rolling boil. Add in the cauliflower and cook for 4 minutes at a rolling boil to soften the cauliflower. Stir occasionally.
Transfer to a high powdered blender and process until ultra smooth.
Place it back in the pot and bring it back to a rolling boil.
Add in the arrowroot powder and whisk immediately for one full minute so that no clumps remain. Cook for 1 one more minute then turn off and let sit.
Video
Notes
As the dairy-free alfredo sits, it will thicken up. Thus, it is best used immediately after making. Especially if you plan to pour it over gluten-free noodles.Make sure the cauliflower is chopped into fine pieces or even grated. This helps it cook quickly and blend smoothly. Alfredo chunks are not delicious.You can store this sauce in the fridge but it will thicken up immensely and resemble glue. It does thin out slightly when heated on low for a bit.Make sure to continue to whisk as you add in the arrowroot starch as it tends to clump. At it slowly and whisk the entire time.Makes 1 ⅓ cups and one serving is ⅓ of a cup.