Heat oven to 375 degrees. Use one tablespoon
butter to thickly grease a 9-by-13-inch baking dish. Combine grated
cheeses and set aside two heaping cups for topping.
In a large bowl, toss together the pasta, cheeses, cayenne (if using)
and salt to taste. Place in prepared pan and evenly pour milk over
surface. Sprinkle reserved cheese on top, dot with remaining butter
and bake, uncovered, 45 minutes. Raise heat to 400 degrees and bake
15 to 20 minutes more, until crusty on top and bottom.
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