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Cook spaghetti according to package directions.
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While spaghetti is still warm, stir in Parmesan cheese, egg, and margarine in a large bowl.
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Pour into well greased 10 inch pie plate and pat mixture up and around sides with a spoon to form a crust.
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Spoon cottage cheese over spaghetti crust.
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In a skillet, brown ground meat, sausage, and onion, then drain off fat and add tomato sauce and seasonings.
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Simmer 10 minutes, stirring occasionally.
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Spoon meat mixture over the cottage cheese.
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Bake at 350 degrees for 30 minutes.
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Arrange mozzarella on top and return to oven just until cheese melts.