Preheat the oven to 350 F/180 C

Boil pasta in water that is generously seasoned with salt and olive oil for 5 minutes. Set aside to cool.

Melt the butter in a large sauté pan. Add the flour and whisk for 1 minute to combine. Pour in the milk and whisk continuously till the sauce thickens. Add the nutmeg, salt, and pepper. Remove the sauce from the stove.

Mix the mozzarella, cheddar, and parmesan cheese together. Add 4 ½ cups of cheese to the warm sauce and mix until all the cheese is melted. Place the pasta in a large bowl and mix with the cheese sauce to combine.

Grease a large oven-proof dish with butter and place the pasta mixture inside. Sprinkle with remaining 1 ½ cups of cheese and bake on middle rack for 30-40 minutes until bubbling and golden brown and crispy on top.

SERVES 12-14