Preheat the oven to 375 degrees F.
Fill a large pot with water and a healthy sprinkling of sea salt. Bring to a boil and add the macaroni noodles. Boil for about 5 minutes, until they are al dente (remembering it’s ok if they are slightly firm because they will cook more in the oven, so you need to calm down). Drain with a colander and transfer to a 9” x 13” baking dish (this recipe will just fit in that!) or desired baking vessel (bonus points for using a large cast iron). Set aside.
In a high-speed blender, add the cashews and water and blend until smooth and creamy. This should take a minute or two. Add the chopped cheeses, butter, nutmeg, cayenne pepper, turmeric powder, and cornstarch. Start by blending on low and gradually turn up the speed, until you are left with a smooth and creamy sauce, scraping down the sides and moving everything around as needed (please work with your blender… it needs your help and sometimes it feels as though you think it’s invincible.) If using a smaller blender, divide the cashew milk in half and try making the sauce in two separate batches.
Pour the cheese sauce over the noodles in the baking dish. Mix well. Optional: sprinkle the shredded pizza style cheese on top. Then evenly dispersing the butter in small dollops on top.
Bake in the oven, uncovered, for about 30 minutes, until the edges are slightly golden and the cheese is thoroughly melted. Remove from the oven and stir with a large spoon. Let stand for 10 minutes. Serve immediately.