Preheat the oven to 400 degrees. Grease a 10-inch pie plate. In a medium-sized bowl, combine 2 cups cheese and the macaroni; sprinkle into the pie plate. Except for the remaining 1/4 cup cheese, beat the remaining ingredients until smooth for about 15 seconds in a blender on high speed
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(or for 1 minute in a large bowl with a hand beater). Pour into the pie plate.Bake for about 40 minutes, until a knife inserted in the center comes out clean. Sprinkle with the remaining 1/4 cup cheese. Bake until the cheese is melted, 1 to 2 minutes. Cool for 10 minutes then cut into wedges.