Preheat oven to 180 degrees C. Grease a 20x30cm glass baking dish.
Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain and stir in 6 tablespoons sliced butter.
In a medium bowl beat egg yolks with sugar and cream cheese; stir into noodles and add sour cream, cottage cheese and salt. Beat egg whites until stiff and fold into mixture. Transfer mixture to prepared dish.
In a small bowl combine melted butter, 1/4 cup sugar and biscuit crumbs. Sprinkle over noodle mixture.