Cook macaroni al dente, approximately 6-8 minutes

Drain pasta and set aside

Spray an 8-inch by 8-inch baking dish with cooking spray

Add macaroni to dish

Clean the cauliflower and cut into florets

Toss with half of the truffle oil and a sprinkle of salt and pepper

Roast in the oven for 5 minutes and turn over. Roast for an additional 5 minutes.

Place butter, flour, salt, milk, and  into the Vitamix container in the order listed and secure lid

Turn machine on and slowly increase speed from Variable 1 to Variable 10, blending for approximately 1 minute

Remove the lid and add the cauliflower 

Blend for 3-4 minutes or until heavy steam escapes through the lid opening

Remove the lid plug and add cheeses through the lid opening

Blend for 1 minute

Pour over macaroni and mix thoroughly

Cover macaroni with bread crumbs and extra cheddar and Gruyere cheeses

Bake at 350°F for 30-40 minutes, or until topping has browned