Preheat oven to 350 degrees F (175 degrees C).Bring a large pot of lightly salted water to a boil, add pasta, and cook until done; drain.
In 9×13 inch baking dish, stir together macaroni, shredded Cheddar cheese, cottage cheese, sour cream, Parmesan cheese, salt and pepper. In a small bowl, mix together bread crumbs and melted butter. Sprinkle topping over macaroni mixture.
Bake 30 to 35 minutes, or until top is golden.
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