Bring medium pot of water to boil. Add cauliflower and boil for 15 minutes or until tender.
Prepare pasta according to directions on package.
Drain cauliflower. Prepare cheese sauce by combing cauliflower in blender with all ingredients (except pasta and paprika). Blend until completely smooth.
When pasta is finished cooking, stir in as much cheese sauce as needed (I used ¾ of batch).
Transfer to baking dish. Sprinkle with nutritional yeast and paprika. Bake for 15 minutes, until edges are golden. Serve warm.
Recipe by The Colorful Kitchen at https://thecolorfulkitchen.com/2014/10/13/cauliflower-mac-n-cheese-vegan-gluten-free/